Is it the 1% sample of 1860 representative at county level?

I want to know the number of people that were in correctional institutions in 1860 for each of the counties, is it OK to use the sample weights to calculate the total number of people sent to correctional institutions by using the group quarters information? Thanks

Yes, the 1860 1% data is representative at the county level and includes group quarters information. So, in principal this is possible. One issue that may occur is that in some counties there are relatively few people in correctional institutions, so the margin of error around the estimate may be relatively large.