ZIP Code Lookup

Use this application to list U.S. ZIP codes by state or search for ZIP codes by place name. Results include preferred and alternate place names, latitude/longitude, and land area for each ZIP code. Results also include several indicators from the 2009-2013 American Community Survey: total population, number of housing units, median family income (MFI), and percentile rank of MFI.

Geographic Codes Lookup

This is a single reference for all common geographic codes in the United States, organized by state. Geographic levels include:

  • counties
  • places (cities)
  • county subdivisions
  • various kinds of metropolitan/micropolitan areas
  • urban clusters and urbanized areas
  • school districts

This listing also includes a population count (2010 Census) for each listed geography.

Circular Area Profiles (CAPS)

The CAPS application aggregates census data to approximate circular areas specified by the user using a point location and one or more radius values. There are two versions of this application: CAPS10c uses basic demographic data from the 2010 Census (Summary File 1); CAPS10ACS uses more detailed and recent data regarding income, poverty, education, etc. from the American Community Survey.


One of MCDC’s oldest and most frequently accessed web applications, MABLE/Geocorr generates geographic correspondence files showing how geographic areas overlap (for example, how ZIP codes relate with counties and/or school districts.)

All census data consist of summary statistics that describe geographic areas. (There are no census data for individual persons or households.) Geography provides the framework for census survey design, sample selection, data collection, tabulation, and dissemination.


A single code — the geoID — identifies every geographic entity in census data products. The geoID may be up to 40 characters long. Longer codes usually represent smaller entities. GeoIDs have a specific format for all areas:

  • Characters 1-3: summary level (see below)
  • Characters 4-5: geographic component (allows division of a geographic unit by certain tests, such as rural/urban)
  • Characters 6-7: always “US”
  • The remaining characters provide a unique identifier within the specified summary level. For states and smaller entities, the first two characters are the state’s code.

For example: Columbia, Missouri’s geoID is 16000US2915670, which can be interpreted as:

  • Summary level: 160 (place)
  • Geographic component: 00 (i.e., total)
  • State: 29 (Missouri)
  • Place code: 15670 (Columbia)

Summary Levels

The Census Bureau uses summary levels for most of its data products. A summary level represents the concept of a geographic level. Summary levels provide a hierarchical arrangement of geographic entities that allows for data ranking, sorting, aggregation, and mapping.

Different data products may use different sets of summary levels. For example, the ACS does not report data for census blocks (summary level 101).

All MCDC census data applications use summary levels (sometimes called “area type”) to organize, filter, and/or search for particular geographic areas. The following list includes only those summary levels most commonly used in MCDC applications.

010: Nation
The whole United States, including Puerto Rico and the U.S. Pacific Islands. GeoID: 01000US
020: Region
One of four large statistical groups of U.S. states and the District of Columbia (map). Example: Midwest Region (02000US2)
030: Division
One of nine statistical subdivisions of regions, about four to eight states each (map). Example: Mountain Division, part of West Region (03000US8)
040: State
One of the 50 U.S. states, Puerto Rico, and the District of Columbia. Example: Missouri (04000US29)
050: County
U.S. county or county equivalent. Example: Boone County, MO (05000US29019)
060: Minor Civil Division (MCD)
An administrative or legal division of a county, such as township or precinct. Not all states or counties have MCDs. Example: Galena township, Jasper County, MO (06000US2909726236)
160: Place
Loosely defined, any concentration of population. In practice, places include incorporated cities, towns and villages (legal entities) and Census Designated Places (populated areas that lack separate government, but are useful for statistical purposes). Example: Alba city, MO (16000US2900496)
140: Tract
A statistical subdivision of a county for purposes of census data collection. Census tracts generally have a population size between 1,200 and 8,000 people, with an optimum size of 4,000 people. Tract boundaries are relatively permanent, so tracts may be compared across different census years or data products. Example: Census Tract 105, Cole County, MO (14000US29051010500)
150: Block Group
A statistical subdivision of a census tract. Block groups generally contain 600–3,000 people, and never cross state, county, or census tract boundaries. Example: Block Group 2, Tract 9501.00, Adair County, MO (15000US290019501002)
101: Block
The smallest statistical unit of the U.S. Census. Census blocks cover the entire territory of the United States, Puerto Rico, and the Island Areas. Census blocks nest within all other tabulated census geographic entities and are the basis for all tabulated data. Example: Block 1000, Tract 9503.00, Butler County, MO (10100US290239503001000)
320: Metropolitan/Micropolitan Area
A statistical entity containing a substantial population nucleus, together with adjacent communities having a high degree of economic and social integration with that core. A metropolitan statistical area must have at least one urbanized area of 50,000 or more inhabitants. A micropolitan statistical area must have at least one urban cluster of at least 10,000 but less than 50,000 population. Metropolitan and micropolitan areas are collectively abbreviated as CBSA. Example: Joplin, MO Metro Area (32000US2927900)
400: Urban Area
A statistical entity defined by a minimum density. There are two types: Urbanized Areas have populations of greater than 50,000. Urban Clusters have populations between 2,500 and 50,000. Example: Branson, MO Urban Cluster (40000US09676)
340: Combined Statistical Area
A group of adjacent multiple metro-/micropolitan areas. Example: Denver-Aurora-Boulder, CO CSA (34000US08216)
795: Public Use Microdata Area (PUMA)
A statistical entity intermediate in size between county and state containing at least 100,000 people. PUMAs cover the entire U.S., are entirely contained in states, and do not overlap. Example: Boone County PUMA, MO (79500US2900600)
860: ZIP Census Tabulation Area (ZCTA)
A generalized areal representation of a U.S. Postal Service ZIP Code service area. ZCTAs are similar in extent and boundaries to ZIP codes. Example: 65203 (86000US65203)