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Congressional Apportionment by State
  -- 2010 & projected 2020 state by state congressional seats

What will the results of Census 2020 tell us us about how the House of Representatives will be reapportioned, state by state? This section examines scenarios which might occur based on state population projections.

- view interactive 2010/2020 apportionment table below
- use the GIS tools and project to make your own map views ... see below

This section has been developed using
- 2020 apportionment population projections
  ... part of the ProximityOne Situation & Outlook (S&O)
- the reapportionment/redistricting feature of the CV XE GIS software
The 2020 population projections reflect anticipated change under one scenario. Those values are then used in the CV XE GIS reapportionment operation to compute the number of House seats shown in the table below.

Apportionment of the U.S. House of Representatives
  -- based on the 2010 Census

- view created with CV XE GIS. Click graphic for larger view with more detail.

Apportionment of the U.S. House of Representatives
  -- based on ProximityOne 2020 Population Projections

- view created with CV XE GIS. Click graphic for larger view with more detail.

Congressional apportionment is the process of dividing the 435 memberships, or seats, in the House of Representatives among the 50 states based on the population figures collected during the decennial census. The number of seats in the House has grown with the country. Congress sets the number in law and increased the number to 435 in 1913. The Constitution set the number of representatives at 65 from 1787 until the first Census of 1790, when it was increased to 105 members. More about apportionment.

Initial Census 2020 demographic data, the apportionment data, will be released by December 31, 2020. See related Census 2010 Apportionments.

Apportionment totals were calculated by a congressionally defined formula, in accordance with Title 2 of the U.S. Code, to divide among the states the 435 seats in the U.S. House of Representatives. The apportionment population consists of the resident population of the 50 states, plus the overseas military and federal civilian employees and their dependents living with them who could be allocated to a state. Each member of the House represents, on average, about 710,767 people for Census 2010.

2010 & 2020 U.S. House Apportionment by State based on 2010 Census & Projected 2020 Population
  & Apportionment of the U.S. House of Representatives: 1910 to 2010 -- Interactive Table
  Click column header to sort; click again to sort other direction.
  See usage notes below table. See related Related Interactive Tables

Usage Notes
  • Use Select Area to select/filter county.
      - Click ShowAll button first.
  • -1 denotes NA
Column Headers
- State Name
- St
- 2010 Apportionment Population
- 2020 Apportionment Population
- 2010-20 Population Change
- 2010-20 Population %Change
- Seats Change 2010-20
- Seats 2020 (projected)
- Seats Change 2000-10
- Seats 2010
- Seats 2000
- Seats 1990
- Seats 1980
- Seats 1970
- Seats 1960
- Seats 1950
- Seats 1940
- Seats 1930
- Seats 1920
- Seats 1910

Using Apportionment GIS Project .. goto top
These operations require a Windows computer with Internet connection
Operations require ProximityOne User Group ID (join now)

1. Install the ProximityOne CV XE GIS
... not required if already installed.
... run the CV XE GIS installer
... take all defaults during installation
2. Download the Apportionment GIS Project fileset
... Expand Apportionment GIS Project to local folder c:\apportionment
3. Open the c:\apportionment\apportionment1.gis project
... after completing the above steps, click File>Open>Dialog
... open the file named c:\apportionment\apportionment1.gis
4. Done. The start-up view is shown at top of this section.

More About Apportionment .. goto top
The first decennial census was conducted in 1790 and has been taken every ten years as mandated by Article I, Section 2 of the U.S. Constitution. Since the first census, conducted by Thomas Jefferson, the decennial count has been the basis for our representative form of government as envisioned by our nation's Founding Fathers. In 1790, each member of the House of Representatives represented about 34,000 residents. Today, the House has more than quadrupled in size, and each member represents about 19 times as many constituents. In 2000, each member of the House of Representatives represented a population of about 647,000.

The apportionment population consists of the resident population of the 50 states, plus the overseas military and federal civilian employees and their dependents living with them who could be allocated to a state. The populations of the District of Columbia and Puerto Rico are excluded from the apportionment population because they do not have voting seats in the U. S. House of Representatives.

The apportionment totals are calculated by a congressionally defined formula in accordance with Title 2 of the U.S. Code.

ProximityOne User Group .. goto top
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Additional Information
ProximityOne develops geodemographic-economic data and analytical tools and helps organizations knit together and use diverse data in a decision-making and analytical framework. We develop custom demographic/economic estimates and projections, develop geographic and geocoded address files, and assist with impact and geospatial analyses. Wide-ranging organizations use our tools (software, data, methodologies) to analyze their own data integrated with other data. Follow ProximityOne on Twitter at Contact us (888-364-7656) with questions about data covered in this section or to discuss custom estimates, projections or analyses for your areas of interest.

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