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Ada County, Idaho
Seal of Ada County, Idaho
Seal
Map of Idaho highlighting Ada County
Location in the state of Idaho
Map of the U.S. highlighting Idaho
Idaho's location in the U.S.
Founded December 22, 1864
Named for Ada Riggs,
first pioneer child born in county
Seat Boise
Largest city Boise
Area
 - Total
 - Land
 - Water

1,060.33 sq mi (2,746 km²)
1,054.99 sq mi (2,732 km²)
5.34 sq mi (14 km²), 0.5%
Population
 - (2020)
 - Density

494,967
285/sq mi (110/km²)
Time zone Mountain: UTC-7/-6
Website www.adaweb.net

Ada County is a county in the southwestern part of the U.S. state of Idaho. As of the 2020 Census, the county had a population of 494,967.[1] The county seat and largest city is Boise, which is also the state capital.[2][3] Other cities in the county with over 10,000 residents include Meridian, Eagle, Kuna, and Garden City.[4] Ada County is by far the state's largest in population, containing more than one quarter of the state's residents, and contains its only county highway district; the Ada County Highway District (ACHD) has jurisdiction over all the local county and city streets, except for private roads and state roads.

Ada County is part of the Boise City-Nampa, Idaho Metropolitan Statistical Area.

History[]

Ada County was created by the Idaho Territorial Legislature on December 22, 1864, partitioned from Boise County. It is named for Ada Riggs, the first pioneer child born in the area and the daughter of H.C. Riggs, a co-founder of Boise.[5] Canyon County, which originally included Payette County and most of Gem County, was partitioned from western Ada County in 1891.

Geography[]

According to the 2000 census, the county has a total area of 1,060.33 square miles (2,746.2 km2), of which 1,054.99 square miles (2,732.4 km2) (or 99.50%) is land and 5.34 square miles (13.8 km2) (or 0.50%) is water.[6] The Boise River flows through the northern portion of the county, and the northwest border is bounded by the foothills of the Boise Range mountains, the summits are in adjacent Boise County. The southwestern border of the county is bounded by the Snake River.

Adjacent counties[]

National protected areas[]

  • Boise National Forest (part)
  • Snake River Birds of Prey National Conservation Area (part)

Highways[]

  • I-84.svg - Interstate 84
  • I-184.svg - Interstate 184
  • US 20.svg - US 20
  • US 26.svg - US 26
  • US 30.svg - US 30
  • ID-16.svg - SH-16
  • ID-21.svg - SH-21 - Ponderosa Pine Scenic Byway
  • ID-44.svg - SH-44
  • ID-55.svg - SH-55 - Payette River Scenic Byway
  • ID-69.svg - SH-69

County roads and highways are maintained by the Ada County Highway District (ACHD).

Demographics[]

Historical populations
Census Pop.
1870 2,675
1880 4,674 74.7%
1890 8,638 84.8%
1900 11,559 33.8%
1910 29,088 151.6%
1920 35,213 21.1%
1930 37,925 7.7%
1940 50,401 32.9%
1950 70,649 40.2%
1960 93,460 32.3%
1970 112,230 20.1%
1980 173,036 54.2%
1990 205,775 18.9%
2000 300,904 46.2%
2010 392,365 30.4%
sources:[7][8][9]

As of the census[10] of 2000, there were 300,904 people, 113,408 households, and 77,344 families residing in the county. The population density was 285/mi² (110/km²). There were 118,516 housing units at an average density of 112/mi² (43/km²). The racial makeup of the county was 92.86% White, 0.65% Black or African American, 0.69% Native American, 1.74% Asian, 0.15% Pacific Islander, 1.67% from other races, and 2.24% from two or more races. Hispanic or Latino of any race were 4.48% of the population.

There were 113,408 households out of which 36.20% had children under the age of 18 living with them, 55.10% were married couples living together, 9.40% had a female householder with no husband present, and 31.80% were non-families. 23.80% of all households were made up of individuals and 6.07% had someone living alone who was 65 years of age or older. The average household size was 2.59 and the average family size was 3.11.

In the county the population was spread out with 27.30% under the age of 18, 10.30% from 18 to 24, 32.50% from 25 to 44, 20.80% from 45 to 64, and 9.10% who were 65 years of age or older. The median age was 33 years. For every 100 females there were 100.6 males. For every 100 females age 18 and over, there were 98.9 males.

The median income for a household in the county was $46,140, and the median income for a family was $54,416. Males had a median income of $37,867 versus $26,453 for females. The per capita income for the county was $22,519. About 5.40% of families and 7.70% of the population were below the poverty line, including 9.20% of those under age 18 and 5.70% of those age 65 or over.

Government and politics[]

Ada County has traditionally been rather conservative for an urban county. Like Idaho as a whole, it has long been a Republican Party stronghold. The last victory in a presidential election by a Democrat in Ada County was by Franklin D. Roosevelt in 1936. It even rejected Lyndon B. Johnson in 1964 during his 44-state landslide.[11] In 2008 the presidential election in Ada County was more competitive than in previous years; John McCain defeated Barack Obama by six percentage points. Obama became the first Democrat to garner as much as 40 percent of the county's vote since LBJ. In 2016, Donald Trump won the county by only a plurality due to high third party performance. In 2020, whereas the state of Idaho trended very strongly for Trump, he carried Ada County by a slim majority, only beating Biden by around 4 percentage points. This is the narrowest election in decades for Ada County, and the closest a Democrat has come to carrying the county since 1940.

Each party held all of their respective legislative seats in the 2008 elections, but Republicans won two competitive county commission races.[12]

Ada County registered voters by political party (as of November 2, 2020)[13]
Political Party Constitution Democratic Libertarian Republican Unaffiliated Total registered voters
Number of registered voters 731 60,045 3,664 125,925 109,843 300,208
United States presidential election results for Ada County, Idaho[14]
Year Republican Democratic Third party
No.  % No.  % No.  %
2020 130,699 49.98% 120,539 46.10% 10,250 3.92%
2016 93,752 47.91% 75,677 38.68% 26,240 13.41%
2012 97,554 53.53% 77,137 42.33% 7,555 4.15%
2008 93,328 51.63% 82,236 45.49% 5,196 2.87%
2004 94,641 61.05% 58,523 37.75% 1,866 1.20%
2000 75,050 60.78% 40,650 32.92% 7,785 6.30%
1996 61,811 52.50% 43,040 36.55% 12,892 10.95%
1992 49,000 44.48% 31,941 28.99% 29,225 26.53%
1988 54,951 62.92% 30,525 34.95% 1,858 2.13%
1984 60,036 72.40% 21,760 26.24% 1,128 1.36%
1980 55,205 63.79% 21,324 24.64% 10,015 11.57%
1976 41,135 64.39% 21,125 33.07% 1,629 2.55%
1972 36,665 67.51% 12,687 23.36% 4,959 9.13%
1968 30,185 63.04% 11,529 24.08% 6,167 12.88%
1964 25,404 56.40% 19,639 43.60% 0 0.00%
1960 27,703 61.95% 17,017 38.05% 0 0.00%
1956 26,387 69.96% 11,328 30.04% 0 0.00%
1952 27,415 72.65% 10,281 27.24% 40 0.11%
1948 14,972 56.06% 11,253 42.14% 480 1.80%
1944 13,410 55.54% 10,667 44.18% 67 0.28%
1940 12,861 50.85% 12,381 48.95% 51 0.20%
1936 7,581 36.85% 12,027 58.46% 966 4.70%
1932 8,055 45.97% 8,836 50.43% 631 3.60%
1928 10,279 71.84% 3,921 27.40% 108 0.75%
1924 7,220 54.47% 3,780 28.52% 2,255 17.01%
1920 8,419 66.72% 4,173 33.07% 27 0.21%
1916 5,299 48.32% 5,207 47.48% 460 4.19%
1912 3,198 32.00% 2,569 25.71% 4,227 42.30%
1908 4,778 53.08% 3,721 41.34% 503 5.59%
1904 4,536 69.51% 1,466 22.46% 524 8.03%
1900 2,706 56.63% 2,072 43.37% 0 0.00%
1896 851 35.33% 1,531 63.55% 27 1.12%
1892 1,170 41.39% 0 0.00% 1,657 58.61%



The Idaho Department of Correction operates the South Boise Prison Complex,[15] is a correctional complex located in unincorporated Ada County, near Kuna.[16]

Cities[]

  • Kuna
  • Meridian
  • Star

See also[]

  • National Register of Historic Places listings in Ada County, Idaho

References[]

  1. ^ http://www.idahoreporter.com/2011/census-data-shows-eight-idaho-counties-lost-population/
  2. ^ "Find a County". National Association of Counties. http://www.naco.org/Counties/Pages/FindACounty.aspx. Retrieved 2011-06-07. 
  3. ^ Idaho Department of Commerce (2011). "Facts About Idaho". Idaho Department of Commerce. http://www.visitidaho.org/facts-about-idaho/. Retrieved 2011-11-10. 
  4. ^ Table 4: Annual Estimates of the Population for Incorporated Places in Idaho, Listed Alphabetically: April 1, 2000 to July 1, 2006 (SUB-EST2006-04-16) accessed 2007-07-16
  5. ^ Idaho.gov - Ada County - accessed 2009-05-31
  6. ^ "Census 2000 U.S. Gazetteer Files: Counties". United States Census. http://www.census.gov/tiger/tms/gazetteer/county2k.txt. Retrieved 2011-02-13. 
  7. ^ Ada County QuickFacts, United States Census Bureau, 2009-02-20, accessed 2009-05-31
  8. ^ 1864 Ada County reference page, Idaho State Historical Society, accessed 2009-06-02.
  9. ^ census.gov - Idaho population by county, 1900-90 accessed 2009-05-03
  10. ^ "American FactFinder". United States Census Bureau. http://factfinder.census.gov. Retrieved 2008-01-31. 
  11. ^ "1964 Presidential General Election Results - Idaho". http://uselectionatlas.org/RESULTS/state.php?f=0&fips=16&year=1964. 
  12. ^ "Election shows GOP still has the edge in Ada County". http://www.idahostatesman.com/election/story/563294.html. 
  13. ^ "Voter Registration Totals as of April 6, 2020". https://sos.idaho.gov/elect/VoterReg/2020/04/partybycounty.html. 
  14. ^ Leip, David. "Atlas of US Presidential Elections". http://uselectionatlas.org/RESULTS. 
  15. ^ "Information Technology Projects." Idaho Department of Correction. March 2011. Retrieved on June 3, 2011.
  16. ^ "Locations." Idaho Department of Correction. Retrieved on June 4, 2011. Kuna area addresses: "South Idaho Correctional Institution Community Work Center (CWC) 14195 S. Pleasant Valley Road Kuna ID 83634" "Correctional Alternative Placement Program (CAPP) 15505 S. Pleasant Valley Rd. Kuna ID 83634" "Idaho Correctional Center (ICC) 14601 S. Pleasant Valley Rd Kuna ID 83634" "Idaho Maximum Security Institution (IMSI) 13400 S. Pleasant Valley Rd Kuna ID 83634" "Idaho State Correctional Institution (ISCI) 13500 S. Pleasant Valley Rd Kuna ID 83634" "South Boise Women's Correctional Center (SBWCC) 13200 S. Pleasant Valley Rd. Kuna ID 83634" "South Idaho Correctional Institution (SICI) 13900 S. Pleasant Valley Rd Kuna ID 83634"

Further reading[]

External links[]

Coordinates: 43°27′N 116°14′W / 43.45, -116.24


This page uses content from the English language Wikipedia. The original content was at Ada County, Idaho. The list of authors can be seen in the page history. As with this Familypedia wiki, the content of Wikipedia is available under the Creative Commons License.
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