MAPPING & DATA RESOURCES
HOUSE OF REPRESENTATIVES
Chart: Distribution of House District Populations
Estimated % deviation from 'ideal' population (4,162 per member) based on composite population estimate.
Table: House District Population Estimates & Projected Deviation from 2020 Ideal
Table: Senate District Population Estimates & Projected Deviation from Ideal
Estimated Ideal population is 21,164 per Senator based on composite population estimate.
Data Downloads & Methodology
Population estimates used are a composite using American Community Survey 2015-2019 (5-year) and ESRI population projections for July 1, 2020 (June 2020 release). ESRI's methodology paper notes, "To measure current population change by block group, Esri models the change in households from multiple sources: Experian; the US Postal Service (USPS); Metrostudy, a Hanley Wood company; and Axiometrics, in addition to several ancillary sources." ESRI's estimates are made at the Census block group level and were aggregated or apportioned to the House and Senate districts. The '2019' estimates on this page are an average of the ACS 2019 5-year and ESRI 2020 numbers.
PLEASE NOTE: These estimates have relatively high margins-of-error and actual 2020 Census counts could differ significantly in some areas. Redistricting data files and geography products are typically delivered in March of 2021, however delays may be possible.