# 1970 census files **URL:** \ **Category:** General\ **Created:** [January 7, 2026, 1:49pm UTC](https://forum.ipums.org/t/1970-census-files/6912 "2026-01-07T13:49:46Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![olehw](https://avatars.discourse-cdn.com/v4/letter/o/e480ec/32.png) [@olehw](https://forum.ipums.org/u/olehw)\ **Post date:** [January 7, 2026, 1:49pm UTC](https://forum.ipums.org/t/1970-census-files/6912/1 "2026-01-07T13:49:46Z")
Is it possible to integrate the 4 1% files into one file? ---
**Author:** ![Ivan\_Strahof](https://sea1.discourse-cdn.com/flex019/user_avatar/forum.ipums.org/ivan_strahof/32/626_2.png) [@Ivan\_Strahof](https://forum.ipums.org/u/Ivan_Strahof)\ **Post date:** [January 9, 2026, 6:01pm UTC](https://forum.ipums.org/t/1970-census-files/6912/2 "2026-01-09T18:01:02Z")
IPUMS USA offers [six samples from the 1970 Census](https://usa.ipums.org/usa/sampdesc.shtml#us1970a), each containing records for 1% of the US population. The samples differ by the level of geographic detail identified (State, metro, and neighborhood) as well by questionnaire variant. While all Census respondents received the same short-form questionnaire, one-in-five households also responded to a long-form questionnaire with additional questions. There were two variants of the long-form questionnaire (i.e., Form 1 and Form 2). As a result, both Form 1 and Form 2 samples include data on the same set of core variables as well as a different set of additional variables for each form. It is possible to pool together the three Form 1 1970 samples (or the three Form 2 samples) in order to create a 3% sample of the form one data since these samples are, for all practical purposes, mutually exclusive. This type of procedure is referenced on [page 8 of the 1970 codebook](https://usa.ipums.org/usa/resources/codebooks/1970_PUMS_codebook.pdf). Additionally, since respondents received either the Form 1 or Form 2 questionnaire, samples across these different forms can also be pooled together. Please refer to [this previous forum thread](https://forum.ipums.org/t/combining-1970-samples/5473/2) for more information as well as how to properly weight this type of pooled sample. ---
**Author:** ![olehw](https://avatars.discourse-cdn.com/v4/letter/o/e480ec/32.png) [@olehw](https://forum.ipums.org/u/olehw)\ **Post date:** [January 9, 2026, 7:08pm UTC](https://forum.ipums.org/t/1970-census-files/6912/3 "2026-01-09T19:08:09Z")
Hi Ivan, Thank you very much for the detailed answer. This is very helpful. IPUMS makes an important contribution to research and it is greatly appreciated. Oleh In a message dated 1/9/2026 1:15:11 PM Eastern Standard Time, [notifications@ipums.discoursemail.com](mailto:notifications@ipums.discoursemail.com) writes: