# NHGIS **URL:** https://forum.ipums.org/c/nhgis/26.md?page=1 [Latest](https://forum.ipums.org/latest.md) · [Categories](https://forum.ipums.org/categories.md) **Page:** 2 --- ## [Block-Level Tables from 1990 - Missing Uninhabited blocks?](https://forum.ipums.org/t/block-level-tables-from-1990-missing-uninhabited-blocks/6301)
**Author:** [@Elly\_Field1](https://forum.ipums.org/u/Elly_Field1)\ **Replies:** 2\ **Last updated:** [January 22, 2025, 8:49pm UTC](https://forum.ipums.org/t/block-level-tables-from-1990-missing-uninhabited-blocks/6301 "2025-01-22T20:49:31Z")
When matching data from IPUMS NHGIS tables to the GIS files, I noticed that for the Census 1990, what seems like uninhabited blocks (things like city parks, train stations, ponds, etc) just don’t appear at all in the tab… --- ## [Block-level population and housing unit mismatch in 2020 Census - differential privacy?](https://forum.ipums.org/t/block-level-population-and-housing-unit-mismatch-in-2020-census-differential-privacy/6285)
**Author:** [@rmanduca1](https://forum.ipums.org/u/rmanduca1)\ **Replies:** 4\ **Last updated:** [January 16, 2025, 1:44am UTC](https://forum.ipums.org/t/block-level-population-and-housing-unit-mismatch-in-2020-census-differential-privacy/6285 "2025-01-16T01:44:39Z")
Hello, I am using the NHGIS to do an analysis of both housing units and population at the block level, including breaking out by race and ethnicity. I’m using the 2020\_DHCa data for both, getting population by race and … --- ## [Census Tract with 0 or missing population](https://forum.ipums.org/t/census-tract-with-0-or-missing-population/6237)
**Author:** [@Giulia\_Olivero](https://forum.ipums.org/u/Giulia_Olivero)\ **Replies:** 2\ **Last updated:** [December 7, 2024, 2:47pm UTC](https://forum.ipums.org/t/census-tract-with-0-or-missing-population/6237 "2024-12-07T14:47:47Z")
Hello, I am using NHGIS data for decennial census 1990-2000, and ACS 2008-2012 and 2018-2022. I’ve downloaded census-tract level population data (using the NHGIS time series based on nominal census tracts). I have a cou… --- ## [Using 2010-2020 Block group crosswalk](https://forum.ipums.org/t/using-2010-2020-block-group-crosswalk/6217)
**Author:** [@Nathalie\_Gonzalez\_Pr](https://forum.ipums.org/u/Nathalie_Gonzalez_Pr)\ **Replies:** 1\ **Last updated:** [November 22, 2024, 8:07pm UTC](https://forum.ipums.org/t/using-2010-2020-block-group-crosswalk/6217 "2024-11-22T20:07:18Z")
Hello, I’m trying to build tract information from 2022-2018 ACS, 2021-2017ACS, 2020-2016 and 2015-2019 ACS on the share of people who work from home. I want the data to be in at the 2010 block group level. I have a co… --- ## [Race/ethnicity data at a block level from 1970](https://forum.ipums.org/t/race-ethnicity-data-at-a-block-level-from-1970/6178)
**Author:** [@HarshaD](https://forum.ipums.org/u/HarshaD)\ **Replies:** 1\ **Last updated:** [November 7, 2024, 1:03am UTC](https://forum.ipums.org/t/race-ethnicity-data-at-a-block-level-from-1970/6178 "2024-11-07T01:03:40Z")
Hello! I’m trying to look at racial demographic data at a block level from the 1970 Census and compare with data from 2020. I’m unable to find it on your site - does this data exist? or can I only find this at a higher g… --- ## [1970 block maps](https://forum.ipums.org/t/1970-block-maps/6101)
**Author:** [@dkopf](https://forum.ipums.org/u/dkopf)\ **Replies:** 7\ **Last updated:** [November 6, 2024, 9:31pm UTC](https://forum.ipums.org/t/1970-block-maps/6101 "2024-11-06T21:31:41Z")
Hi- I was using the 1970 block data for a project and it’s been great. I have been unable to locate any block maps for 1970 anywhere. Do you have a recommendations on how I can understand the block data I am analyzing? … --- ## [Calculate unemployment rate](https://forum.ipums.org/t/calculate-unemployment-rate/6168)
**Author:** [@Yue\_Sun](https://forum.ipums.org/u/Yue_Sun)\ **Replies:** 2\ **Last updated:** [November 4, 2024, 4:22pm UTC](https://forum.ipums.org/t/calculate-unemployment-rate/6168 "2024-11-04T16:22:48Z")
Hi, I am using time series and census-tract level Table: B84. Persons 16 Years and Over by Labor Force and Employment Status \[6\] for years 2006-2010, 2007-2011, 2008-2012, 2009-2013, 2010-2014, 2011-2015, 2012-2016, 201… --- ## [Title: Discrepancy in County Codes and Duplicates between API and Web Downloads of 2008-2012 ACS Tract-Level Data](https://forum.ipums.org/t/title-discrepancy-in-county-codes-and-duplicates-between-api-and-web-downloads-of-2008-2012-acs-tract-level-data/6165)
**Author:** [@Aniket\_Patil](https://forum.ipums.org/u/Aniket_Patil)\ **Replies:** 4\ **Last updated:** [October 31, 2024, 9:43pm UTC](https://forum.ipums.org/t/title-discrepancy-in-county-codes-and-duplicates-between-api-and-web-downloads-of-2008-2012-acs-tract-level-data/6165 "2024-10-31T21:43:09Z")
Hello, I’m encountering a puzzling discrepancy in the 2008-2012 ACS 5-Year data at the tract level, and I’m hoping someone here can help clarify what’s going on. I have two versions of the same dataset: API Download … --- ## [HMDA Data by Tract](https://forum.ipums.org/t/hmda-data-by-tract/6164)
**Author:** [@Rob\_Breymaier](https://forum.ipums.org/u/Rob_Breymaier)\ **Replies:** 1\ **Last updated:** [October 31, 2024, 4:28pm UTC](https://forum.ipums.org/t/hmda-data-by-tract/6164 "2024-10-31T16:28:51Z")
Has there been any consideration of adding HMDA tables to NHGIS (and other IPUMS data sets)? It would be especially useful to have data by tract, such as # of home purchase loans, average mortgage amount, denial rates, … --- ## [Trying to get addresses within four states](https://forum.ipums.org/t/trying-to-get-addresses-within-four-states/6151)
**Author:** [@Claire\_Richards](https://forum.ipums.org/u/Claire_Richards)\ **Replies:** 1\ **Last updated:** [October 21, 2024, 2:40pm UTC](https://forum.ipums.org/t/trying-to-get-addresses-within-four-states/6151 "2024-10-21T14:40:09Z")
We are conducting a research study of environmental risks and trying to estimate the number of residential structures exposed to a certain risk. Much of the spatial footprint data we could find is limited and has a lot o… --- ## [Pre-1980 County Subdivision Shapefiles](https://forum.ipums.org/t/pre-1980-county-subdivision-shapefiles/6116)
**Author:** [@Simon\_B](https://forum.ipums.org/u/Simon_B)\ **Replies:** 3\ **Last updated:** [October 5, 2024, 3:54pm UTC](https://forum.ipums.org/t/pre-1980-county-subdivision-shapefiles/6116 "2024-10-05T15:54:56Z")
Hello, I have noticed that shapefiles for county subdivisions exist for 1980 onwards but not before. Old election results were typically reported at this level, which makes it a bit challenging to integrate to other cen… --- ## [What shape file should i use?](https://forum.ipums.org/t/what-shape-file-should-i-use/6114)
**Author:** [@Deborah\_Ogunsanmi](https://forum.ipums.org/u/Deborah_Ogunsanmi)\ **Replies:** 1\ **Last updated:** [September 27, 2024, 6:57pm UTC](https://forum.ipums.org/t/what-shape-file-should-i-use/6114 "2024-09-27T18:57:59Z")
I am using 5-year estimates (2018-2022) data for my study. Which year’s shapefile should I use to obtain my FIPS code after geocoding the addresses? --- ## [Best Practices for Converting 1990 Blocks to 2010 Census Tracts and Handling Median Values](https://forum.ipums.org/t/best-practices-for-converting-1990-blocks-to-2010-census-tracts-and-handling-median-values/6110)
**Author:** [@Aniket\_Patil](https://forum.ipums.org/u/Aniket_Patil)\ **Replies:** 1\ **Last updated:** [September 24, 2024, 6:58pm UTC](https://forum.ipums.org/t/best-practices-for-converting-1990-blocks-to-2010-census-tracts-and-handling-median-values/6110 "2024-09-24T18:58:57Z")
Hello, I’ve been using the Longitudinal Tract Database (LTDB) to convert 1990 Census tracts to 2010 Census tracts for some time now. In the LTDB, I’ve been handling median values by applying base values, multiplying the… --- ## [Help with dataset metadata using IPUMS API](https://forum.ipums.org/t/help-with-dataset-metadata-using-ipums-api/6083)
**Author:** [@Aniket\_Patil](https://forum.ipums.org/u/Aniket_Patil)\ **Replies:** 2\ **Last updated:** [September 22, 2024, 10:35pm UTC](https://forum.ipums.org/t/help-with-dataset-metadata-using-ipums-api/6083 "2024-09-22T22:35:51Z")
Hello, I am working with datasets that contain information about housing values, and I’m encountering some challenges in identifying the appropriate geographic level for each dataset and matching them with the correct c… --- ## [Census: 100% vs sample](https://forum.ipums.org/t/census-100-vs-sample/6104)
**Author:** [@Benjamin\_Couillard](https://forum.ipums.org/u/Benjamin_Couillard)\ **Replies:** 2\ **Last updated:** [September 20, 2024, 9:07pm UTC](https://forum.ipums.org/t/census-100-vs-sample/6104 "2024-09-20T21:07:00Z")
Greetings to the community, I am curious about why aggregates sometimes differ between census tables based on 100% counts and based on samples. Since the samples are said to be weighted to match the 100% counts in other… --- ## [Urban rural time series through 2020 by county](https://forum.ipums.org/t/urban-rural-time-series-through-2020-by-county/6099)
**Author:** [@Yekaterina\_Kelly](https://forum.ipums.org/u/Yekaterina_Kelly)\ **Replies:** 2\ **Last updated:** [September 18, 2024, 8:24pm UTC](https://forum.ipums.org/t/urban-rural-time-series-through-2020-by-county/6099 "2024-09-18T20:24:07Z")
I am wondering if there is an approximate timeline for releasing time series standardized to 2020, particularly for the urban/rural geography dataset. From my understanding the definition of rurality changed in 2020, and… --- ## [2000 dec census homeless count data at cen tract level](https://forum.ipums.org/t/2000-dec-census-homeless-count-data-at-cen-tract-level/3795)
**Author:** [@Tasminda\_Dhaliwal](https://forum.ipums.org/u/Tasminda_Dhaliwal)\ **Replies:** 1\ **Last updated:** [October 8, 2020, 7:16am UTC](https://forum.ipums.org/t/2000-dec-census-homeless-count-data-at-cen-tract-level/3795 "2020-10-08T07:16:20Z")
Hi, I am looking for homeless count data from the 2000 decennial census. I was not able to locate these counts using the NHGIS data explorer even though published papers state the data is available from NHGIS at the cens… --- ## [Do Aggregates Include those in Group Quarters (2000 Census))?](https://forum.ipums.org/t/do-aggregates-include-those-in-group-quarters-2000-census/6068)
**Author:** [@Kelsey\_O\_Hollaren](https://forum.ipums.org/u/Kelsey_O_Hollaren)\ **Replies:** 2\ **Last updated:** [August 30, 2024, 7:50pm UTC](https://forum.ipums.org/t/do-aggregates-include-those-in-group-quarters-2000-census/6068 "2024-08-30T19:50:43Z")
Hello, I’m wondering if individuals living in group quarters as defined by the US Census are included in the aggregate data available from NHGIS. I’m using microdata for most of my project, but need to generate estimate… --- ## [Labor force by children in the household](https://forum.ipums.org/t/labor-force-by-children-in-the-household/6064)
**Author:** [@Giulia\_Olivero](https://forum.ipums.org/u/Giulia_Olivero)\ **Replies:** 2\ **Last updated:** [August 26, 2024, 12:03am UTC](https://forum.ipums.org/t/labor-force-by-children-in-the-household/6064 "2024-08-26T00:03:18Z")
Hello, I think there is something strange with the county-level table B23003 from 2010 American Community Survey: 5-Year Data \[2006-2010, Block Groups & Larger Areas\]. It is called “Presence of Own Children Under 18 Ye… --- ## [Is there no dataset for median income by race and ethnicity at the tract level?](https://forum.ipums.org/t/is-there-no-dataset-for-median-income-by-race-and-ethnicity-at-the-tract-level/6063)
**Author:** [@v\_directs](https://forum.ipums.org/u/v_directs)\ **Replies:** 1\ **Last updated:** [August 23, 2024, 2:21am UTC](https://forum.ipums.org/t/is-there-no-dataset-for-median-income-by-race-and-ethnicity-at-the-tract-level/6063 "2024-08-23T02:21:05Z")
I am looking for median income by race and ethnicity (so primarily non-hispanic black, white and asian) at the tract level. However, all that I am seeing is "B19013H. Median Household Income in the Past 12 Months (in 20… --- ## [Sampling weights](https://forum.ipums.org/t/sampling-weights/6062)
**Author:** [@Eunsun\_Gill](https://forum.ipums.org/u/Eunsun_Gill)\ **Replies:** 1\ **Last updated:** [August 22, 2024, 9:31pm UTC](https://forum.ipums.org/t/sampling-weights/6062 "2024-08-22T21:31:45Z")
I want to extract a census variable for the years 1990 and 2000. Among the options in the data extract, I am configured to select two data sets from Source Tables: “2000 Census: SF 3b - Sample-Based Data \[Block Groups\]” … --- ## [Missing data in 9900 tracts?](https://forum.ipums.org/t/missing-data-in-9900-tracts/4421)
**Author:** [@Nora\_Schwaller](https://forum.ipums.org/u/Nora_Schwaller)\ **Replies:** 4\ **Last updated:** [August 21, 2024, 4:12pm UTC](https://forum.ipums.org/t/missing-data-in-9900-tracts/4421 "2024-08-21T16:12:41Z")
Hi there, I am using ACS 5-year 2015 data, for basic demographic information (population, race, housing, education). I have about 350 tracts that are missing data, most seem to be in the 9900s (e.g. Census Tract 9900, Ba… --- ## [Oklahoma / "Indian Lands" in 1860 Census](https://forum.ipums.org/t/oklahoma-indian-lands-in-1860-census/6055)
**Author:** [@rmanduca1](https://forum.ipums.org/u/rmanduca1)\ **Replies:** 2\ **Last updated:** [August 20, 2024, 6:31pm UTC](https://forum.ipums.org/t/oklahoma-indian-lands-in-1860-census/6055 "2024-08-20T18:31:33Z")
I am looking for information on Oklahoma in the 1860 Census, specifically the number or proportion of people who were enslaved. When I download the 1860 data at the state or county level from NHGIS, I do not see a line f… --- ## [Census tract for a City 2000 and 2010](https://forum.ipums.org/t/census-tract-for-a-city-2000-and-2010/6040)
**Author:** [@Nusrat\_Atika](https://forum.ipums.org/u/Nusrat_Atika)\ **Replies:** 1\ **Last updated:** [August 7, 2024, 5:41pm UTC](https://forum.ipums.org/t/census-tract-for-a-city-2000-and-2010/6040 "2024-08-07T17:41:49Z")
Hi, I need to find census tract levels for the city of Detroit for 2000 and 2010, how can I go on about it? for 1960-1990, I found pdfs from census and looked through the SMSA/MSA info to manually find the census tract … --- ## [1990 ZIP Code vs. 2000 ZCTA](https://forum.ipums.org/t/1990-zip-code-vs-2000-zcta/6033)
**Author:** [@Katherine\_Patterson](https://forum.ipums.org/u/Katherine_Patterson)\ **Replies:** 1\ **Last updated:** [August 2, 2024, 3:12pm UTC](https://forum.ipums.org/t/1990-zip-code-vs-2000-zcta/6033 "2024-08-02T15:12:36Z")
Hello, I am looking at a ZCTA level census file (persons by sex by age) from 1990 to 2010. However, I noticed that the source file for 1990 includes ZIP code, and not ZCTA. Is there functionally any difference between t… --- ## [1980 Block Group Tabs != Blocks/Tracts?](https://forum.ipums.org/t/1980-block-group-tabs-blocks-tracts/5966)
**Author:** [@Daniel\_Moulton](https://forum.ipums.org/u/Daniel_Moulton)\ **Replies:** 5\ **Last updated:** [July 15, 2024, 5:52pm UTC](https://forum.ipums.org/t/1980-block-group-tabs-blocks-tracts/5966 "2024-07-15T17:52:39Z")
Greetings! I’m wonder why 1980 Block Group tabulations (aggregating the rural and urban records) don’t always equal the same counts when either calculated from the block level up to block group or by aggregating block g… --- ## [1990-2000 crosswalk (census tracts)](https://forum.ipums.org/t/1990-2000-crosswalk-census-tracts/5960)
**Author:** [@Sarah\_Halvorson-Frie](https://forum.ipums.org/u/Sarah_Halvorson-Frie)\ **Replies:** 1\ **Last updated:** [June 27, 2024, 11:11pm UTC](https://forum.ipums.org/t/1990-2000-crosswalk-census-tracts/5960 "2024-06-27T23:11:55Z")
Hi there, I’m trying to harmonize 1990 data to 2000 tract census boundaries. I eventually want to get to census tract level data but understand I should start with the smallest geographic units for which data is availabl… --- ## [CBSA codes for 2000 census data](https://forum.ipums.org/t/cbsa-codes-for-2000-census-data/5957)
**Author:** [@Sarah\_Halvorson-Frie](https://forum.ipums.org/u/Sarah_Halvorson-Frie)\ **Replies:** 4\ **Last updated:** [June 27, 2024, 8:30pm UTC](https://forum.ipums.org/t/cbsa-codes-for-2000-census-data/5957 "2024-06-27T20:30:26Z")
I’m having trouble finding CBSA codes for 2000 census data. My extracts have MSA\_CMSAA, CMSA, MACCI, and PMSAA. It looks like CBSAs were developed for the 2000 census (About) but I can’t find those codes or boundaries. A… --- ## [2010 - 2020 Tract Geographic Crosswalk?](https://forum.ipums.org/t/2010-2020-tract-geographic-crosswalk/4795)
**Author:** [@Taylor\_Lampe](https://forum.ipums.org/u/Taylor_Lampe)\ **Replies:** 15\ **Last updated:** [June 26, 2024, 8:38pm UTC](https://forum.ipums.org/t/2010-2020-tract-geographic-crosswalk/4795 "2024-06-26T20:38:10Z")
Hi, we are hoping to use a 2010-2020 tract geographic crosswalk (built from the block crosswalk) in order to avoid going down to the block-level every time we transform data across census vintages. Is there a pre-existin… --- ## [Interpreting "place of work -- place level" variable](https://forum.ipums.org/t/interpreting-place-of-work-place-level-variable/5891)
**Author:** [@Natalie\_Yang](https://forum.ipums.org/u/Natalie_Yang)\ **Replies:** 5\ **Last updated:** [May 22, 2024, 7:56pm UTC](https://forum.ipums.org/t/interpreting-place-of-work-place-level-variable/5891 "2024-05-22T19:56:29Z")
Hello, I am looking at Table B08008, which is the “Sex of Workers by Place of Work–Place Level” table from the 2022 ACS 5-year estimates. I am working with the tract-level data. I am having trouble interpreting the vari… [Previous page](https://forum.ipums.org/c/nhgis/26.md) [Next page](https://forum.ipums.org/c/nhgis/26.md?page=2)