[CTPP News] Re: Defining PUMAs for Census 2020 When will the 2020 Census Summary File #1 be released?

Hi Chuck- RE: QUESTION: When will the 2020 Census Summary File #1 be released? Census Bureau announced in 2019 that the product formerly known as SF1 would be reduced -- fewer tables, especially fewer crosstabs -- and that the new collection of tables would be called Demographic & Housing Characteristics (DHC). I have not seen any news lately on what the final set of DHC tables will include. It's possible that this is *still* unsettled? I am not surprised that you found nothing on census.gov. Census execs were earlier promising DHC as a product... but then in 2021 they pivoted to: make no promises of anything. They scrubbed mentions of DHC off of census.gov. (oh. But they didn't get everything... https://www2.census.gov/about/partners/cac/nac/meetings/2021-05/presentatio… ) WHEN will we see the DHC product? was asked by journalists at the August 12 webcast press conference - and Census spokespeople would not answer the question. Hopefully we get DHC product sometime in 2022. Earlier than 2022 seems unlikely because DAS/Differential Privacy processing is going to add multiple months. But I would be guessing. Again, If someone has actual intel, point us there! --TG [Metropolitan Council Logo] Todd Graham Principal Forecaster | Research Metropolitan Council 390 North Roberrt Street, St. Paul, MN 55101 Ph. 651-602-1322 metrocouncil.org<https://www.metrocouncil.org/data> | facebook<https://www.facebook.com/MetropolitanCouncil> | twitter<https://twitter.com/metcouncilnews> From: Charles Purvis &lt;clpurvis(a)att.net&gt; Sent: Wednesday, August 25, 2021 1:31 PM To: The Census Transportation Products Program Community of Practice/Users discussion and news list &lt;ctpp(a)listserv.transportation.org&gt; Subject: [CTPP News] Re: Defining PUMAs for Census 2020 Todd: The pro-tips on building PUMAs (discourage splitting counties; encourage consistency with city boundaries) make great sense. (I've had a lot of fun using the POWPUMA data from PUMS. In California we have 58 counties and 41 POWPUMAs. Good for trying to analyze county-to-county commute patterns over the years.) QUESTION: When will the 2020 Census Summary File #1 be released? I can't find the information on the Census Bureau's website. My hunch is that it will be about four months after the PL 94-171 data is released, perhaps by December 2021??? The SF1 (STF1A to old-timers) will have the detailed "short form" tabulations including: households by household size, detailed age cohort tables; householder tables; detailed hispanic groups; detailed asian groups; owner/renter tenure; etc. Chuck On Aug 23, 2021, at 1:01 PM, Graham, Todd <todd.graham@metc.state.mn.us<mailto:todd.graham@metc.state.mn.us>> wrote: Hi Chuck- Thanks for the heads-up. Yes, that is the way to think of PUMAs = as "super-districts" or sub-state regions. Here are my "pro-tips" learned in PUMA drawing 10 years ago: 1. Do not group together fractional pieces of counties when you could keep a county whole, or when you could group multiple whole counties together in a PUMA. 2. When splitting counties into multiple PUMAs, try to arrange for the split lines to be stable city/town boundaries. This means you're looking to create PUMAs where city/town boundaries are aligned with Tract boundaries. (Because Census Geog Dept will require that tracts be the basic units of PUMA assembly.) The reason I emphasize parsimony with counties in point #1 is: The PUMAs you draw will enable or limit the detail of MIGPUMAs as well. (MIGPUMA= Migration origination geographic units) Census Bureau will create MIGPUMAs as the least common denominator grouping of counties that is entirely coincident with a group of PUMAs. So don't split counties unnecessarily. The reason I emphasize city/town boundaries in point #2 -- even though Census Geog discusses tracts as the basic units - is this: The PUMAs you draw will enable or limit the detail of POWPUMAs. (POWPUMAs = Place of Work geographic units) Census Bureau will create POWPUMAs as the least common denominator grouping of counties + places that is entirely coincident with a group of PUMAs. Stated differently: Census looks for combinations of county + place to uniquely nest within a POWPUMA. Why is this the standard for POWPUMAs? It's because of the questions asked on ACS: ACS asks specifically for the county + place of one's work location. The PUMA final criteria document https://www.census.gov/programs-surveys/geography/guidance/geo-areas/pumas/… does say all this, but you'd have to read all the way to the last 3 pages of that document to find it. That's all my advice. Good luck! --Todd Graham