Idaho Gazetteer

Idaho - Basic Information

Became a State: July 3, 1890 - 43rd State
Population: 1,567,582 (2010 Census) - Ranks 39th
Land Area: 82,643.1 square miles - Ranks 11st
Population Density: 19.0 persons per square mile - Ranks 44th
Housing Units: 667,796 (2010 Census)
Housing Unit Density: 8.1 housing units per square mile
July 1, 2015 Estimates: Idaho Data and Demographics
State Capital: Boise
State Website: Official State of Idaho Website
Idaho State Flag
Idaho state flag

Idaho History


The United States acquired the area of Idaho through a treaty with Great Britain in 1846.  Idaho Territory was organized from parts of Dakota, Nebraska, and Washington territories on March 3, 1863, and included parts of present-day Montana and Wyoming. Its area was reduced in 1864 by the organization of Montana Territory and again in 1868 by the organization of Wyoming Territory, to generally the same boundary as the present state. Idaho was admitted to the Union on July 3, 1890, as the 43rd state.

Census data for Idaho are available beginning with the 1870 census. The portion of Yellowstone National Park in Idaho was probably enumerated as part of Wyoming from 1880 to 1910. The area was shown as a separate county equivalent in the census reports for Idaho from 1920 to 1960. The portion of the park in Idaho was legally added to Fremont County before the 1970 census.

Data for the legally established state of Idaho are available beginning with the 1900 census.  The census day for the 1890 census was June 2, 1890.

Idaho Geographical Areas

See: Geographic Terms & Concepts

Counties & County Equivalents

Interactive Map of Idaho Counties | Static Overview Map of Idaho Counties

There are 44 counties in Idaho.  All counties are functioning governmental units, each governed by a board of commissioners.

County Subdivisions

There are 170 county subdivisions in Idaho. They are all census county divisions (CCDs), which are delineated for statistical purposes, have no legal function, and are not governmental units.

Places (Incorporated Cities, Towns & Census Designated Places (CDPs))

Idaho has 227 places; 201 incorporated places and 26 census designated places (CDPs). The incorporated places are all cities.  Lost River city is governmentally inactive. 

Alphabetical List of Cities, Towns, CDPs and Other Populated Places
A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q, R | S | T | U, V | W, X, Y, Z

Neighborhood Data

Address Based Hyperlocal Data Input an address and get data & demographics for the pertinent census block group (CBG), a searchable map and a customized directory. The CBG is the smallest geographical unit used by the Census Bureau for reporting certain data.

Idaho Civil Features

Idaho Civil Features: Political Subdivisions, Native Areas, Land Grants, etc. - sorted by Census Class Codes.

Metropolitan and Micropolitan Stastical Areas

There are 5 Metropolitan and 8 Micropolitan Statistical Areas in Idaho. ID Metopolitan & Micropolitan Areas

Idaho ZIP Code Tabulation Areas

There are 285 ZIP Code tabulation areas (ZCTAs) in Idaho. View Idaho ZIP Codes and ZIP Code Maps.

School Districts

Idaho has 115 unified school districts. View Idaho Public and Private Schools.

Congressional Districts

Idaho has 2 congressional districts. An interactive map shows the contact information for each Representative as well as the boundaries for each Idaho district. View Map of Idaho Congressional Districts.

State Legislative Districts

There are 35 state senate districts and 35 state house districts in Idaho.

American Indian Areas

Idaho has five federally recognized American Indian reservations; two with associated off-reservation trust land.

Other Information Of General Geographic Interest

A portion of Yellowstone National Park is located in Fremont County. The remainder of the park is located in Montana and Wyoming. Prior to the 1970 census, Yellowstone National Park was an entity separate from any county government.

Idaho Physical, Cultural and Historic Features

  1. Idaho Physical Features such as lakes, islands, streams, valleys, summits, etc.
  2. Idaho Cultural Features such as schools, churches, hospitals, parks, dams, reservoirs, etc.
  3. Idaho Historical Features and Idaho Historic Landmarks

Idaho Maps

  • To find a ZIP Code: input the address in the top-left search box of any ZIP Code Map.
  • To find the County: input the address in the top-left search box of the interactive ID map.
  • To find the School Attendance Zone: input the address in the top-left search box of any ID school map

Idaho Census Data Comparison Tool

Compare Idaho Census Data
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