PAI 789 Advanced Policy Analysis > Census Documentation

Census GEOIDs

Area Type

GEOID Structure

Number of Digits

Example Geographic Area

Example GEOID

State

STATE

2

Texas

48

County

STATE+COUNTY

2+3=5

Harris County, TX

48201

County Subdivision

STATE+COUNTY+COUSUB

2+3+5=10

Pasadena CCD, Harris County, TX

4820192975

Places

STATE+PLACE

2+5=7

Houston, TX

4835000

Census Tract

STATE+COUNTY+TRACT

2+3+6=11

Census Tract 2231 in Harris County, TX

48201223100

Block Group

STATE+COUNTY+TRACT+BLOCK GROUP

2+3+6+1=12

Block Group 1 in Census Tract 2231 in Harris County, TX

482012231001

Block

STATE+COUNTY+TRACT+BLOCK

2+3+6+4=15 (Note – some blocks also contain a one character suffix (A, B, C, ect.)

Block 1050 in Census Tract 2231 in Harris County, TX

482012231001050

Congressional District (113th Congress)

STATE+CD

2+2=4

Connecticut District 2

0902

State Legislative District (Upper Chamber)

STATE+SLDU

2+3=5

Connecticut State Senate District 33

09033

State Legislative District (Lower Chamber)

STATE+SLDL

2+3=5

Connecticut State House District 147

09147

ZCTA

ZCTA

5

Suitland, MD ZCTA

20746

Source: https://www.census.gov/programs-surveys/geography/guidance/geo-identifiers.html

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Peter J Wilcoxen, The Maxwell School, Syracuse University
Revised 03/28/2023