What the file contains
The CSV has one row for each of 22,614 geographies: the nation, 50 states, DC, county equivalents and whole incorporated places. Each row carries the internal ID used on this site, official code, type, Census name and state, then twelve observations: the April 1, 2010 estimates base, July 1 estimates for 2010 through 2019, and the April 1, 2020 census count. Blank cells mark dates before a place was incorporated.
Source: sub-est2020int.csv, the Census Bureau’s 2010–2020 Intercensal Subcounty Resident Population Estimates, released November 2024 and retrieved October 29, 2026. State rows use SUMLEV 040, counties 050 and places 162. National totals come from the national intercensal age-sex file. The estimates base reflects Count Question Resolution changes, legal boundary updates and other geographic revisions to the 2010 census.
Validation
For every one of the twelve observations, county totals add up exactly to their state, and the 50 states plus DC add up exactly to the national file. Records are joined to site profiles by official code. Connecticut’s nine planning regions have no series because they replaced counties as statistical units in 2022, and places incorporated after 2020 have none. Source hashes are listed in the README.
Why this series stays separate
All intercensal boundaries are as of 2020, and its April 2020 value is a census count. The Vintage 2025 annual series uses 2025 boundaries and a revised April 2020 estimates base. Profiles therefore draw the two series as separate lines and state the gap between them. Measure growth within one series; a change from July 2019 in this file to July 2021 in Vintage 2025 would mix population change with boundary and base revisions. Read why estimates change.
Reuse
Census statistical works are generally outside U.S. copyright protection under the Census public-access policy (DS027). Cite the Census Bureau file and this release ID. A correction will be published under a new release ID rather than changing these bytes.