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Pima County includes the Tucson, Arizona Metropolitan Statistical Area.
Pima County contains parts of the Tohono O'odham Nation, as well as all of the San Xavier Indian Reservation, the Pascua Yaqui Indian Reservation, Organ Pipe Cactus National Monument, Ironwood Forest National Monument and Saguaro National Park.
The vast majority of the county population lies in and around the city of Tucson (2017 city population: 535,677), filling much of the eastern part of the county with urban development. Tucson, Arizona's second largest city, is a major commercial and academic center. Other urban areas include the Tucson suburbs of Marana (population 44,792), Oro Valley (population 44,350), Sahuarita (population 29,318), and South Tucson (population 5,643), a large ring of unincorporated urban development, and the growing satellite town Green Valley. The rest of the county is sparsely populated; the largest towns are Sells, the capital of the Tohono O'odham Nation, and Ajo in the county's far western region.
Pima County, one of the four original counties in Arizona, was created by the 1st Arizona Territorial Legislature with land acquired through the Gadsden Purchase from Mexico in 1853. The original county consisted of all of Arizona Territory east of longitude 113° 20' and south of the Gila River. Soon thereafter, the counties of Cochise, Graham and Santa Cruz were carved from the original Pima County.
According to the U.S. Census Bureau, the county has a total area of 9,189 square miles (23,800 km2), of which 9,187 square miles (23,790 km2) is land and 2.1 square miles (5.4 km2) (0.02%) is water.
Mountains of Pima County
I-10 (AZ).svg Interstate 10
I-19 (AZ).svg Interstate 19
US 80 (AZ historic).svg Historic U.S. Route 80
Arizona 77.svg State Route 77
Arizona 83.svg State Route 83
Arizona 85.svg State Route 85
Arizona 86.svg State Route 86
Arizona 210.svg State Route 210
Arizona 989.svg State Route 989
Adjacent counties and municipalities
Yuma County – west
Maricopa County – north
Pinal County – north
Graham County – northeast
Cochise County – east
Santa Cruz County – southeast
Altar, Sonora, Mexico – south
Caborca, Sonora, Mexico – south
General Plutarco El?as Calles, Sonora, Mexico – south
S?ric, Sonora, Mexico – south
National protected areas
Buenos Aires National Wildlife Refuge
Cabeza Prieta National Wildlife Refuge (part)
Coronado National Forest (part)
Ironwood Forest National Monument (part)
Official Pima County Logo
Old Pima County Courthouse
Las Cienegas National Conservation Area (part)
Organ Pipe Cactus National Monument
Saguaro National Park
Sonoran Desert Conservation Plan
The Sonoran Desert Conservation Plan (SDCP) is Pima County's plan for desert conservation.
Census Pop. %±
1870 5,716 —
1880 17,006 197.5%
1890 12,673 ?25.5%
1900 14,689 15.9%
1910 22,818 55.3%
1920 34,680 52.0%
1930 55,676 60.5%
1940 72,838 30.8%
1950 141,216 93.9%
1960 265,660 88.1%
1970 351,667 32.4%
1980 531,443 51.1%
1990 666,880 25.5%
2000 843,746 26.5%
2010 980,263 16.2%
Est. 2019 1,047,279 6.8%
U.S. Decennial Census
As of the 2000 census, there were 843,746 people, 332,350 households, and 212,039 families living in the county. The population density was 92 people per square mile (35/km?). There were 366,737 housing units at an average density of 40 per square mile (15/km?). The racial makeup of the county was 75.07% White, 3.03% Black or African American, 3.22% Native American, 2.04% Asian, 0.13% Pacific Islander, 13.30% from other races, and 3.21% from two or more races. 29.34% of the population were Hispanic or Latino of any race. 22.80% reported speaking Spanish at home.
There were 332,350 households out of which 29.20% had children under the age of 18 living with them, 47.70% were married couples living together, 11.80% had a female householder with no husband present, and 36.20% were non-families. 28.50% of all households were made up of individuals and 9.40% had someone living alone who was 65 years of age or older. The average household size was 2.47 and the average family size was 3.06.
In the county, the population was spread out with 24.60% under the age of 18, 10.90% from 18 to 24, 28.40% from 25 to 44, 21.90% from 45 to 64, and 14.20% who were 65 years of age or older. The median age was 36 years. For every 100 females there were 95.70 males. For every 100 females age 18 and over, there were 92.70 males.
The median income for a household in the county was $36,758, and the median income for a family was $44,446. Males had a median income of $32,156 versus $24,959 for females. The per capita income for the county was $19,785. About 10.50% of families and 14.70% of the population were below the poverty line, including 19.40% of those under age 18 and 8.20% of those age 65 or over.
As of the 2010 census, there were 980,263 people, 388,660 households, and 243,167 families living in the county. The population density was 106.7 inhabitants per square mile (41.2/km2). There were 440,909 housing units at an average density of 48.0 per square mile (18.5/km2). The racial makeup of the county was 74.3% white, 3.5% black or African American, 3.3% American Indian, 2.6% Asian, 0.2% Pacific islander, 12.3% from other races, and 3.7% from two or more races. Those of Hispanic or Latino origin made up 34.6% of the population.
The largest ancestry groups were:
Of the 388,660 households, 29.8% had children under the age of 18 living with them, 44.5% were married couples living together, 12.8% had a female householder with no husband present, 37.4% were non-families, and 29.2% of all households were made up of individuals. The average household size was 2.46 and the average family size was 3.06. The median age was 37.7 years.
The median income for a household in the county was $45,521 and the median income for a family was $57,377. Males had a median income of $42,313 versus $33,487 for females. The per capita income for the county was $25,093. About 11.2% of families and 16.4% of the population were below the poverty line, including 22.6% of those under age 18 and 8.5% of those age 65 or over.
Metropolitan Statistical Area
The United States Office of Management and Budget has designated Pima County as the Tucson, AZ Metropolitan Statistical Area. The United States Census Bureau ranked the Tucson, AZ Metropolitan Statistical Area as the 53rd most populous metropolitan statistical area of the United States as of July 1, 2012.
The Office of Management and Budget has further designated the Tucson, AZ Metropolitan Statistical Area as a component of the more extensive Tucson-Nogales, AZ Combined Statistical Area, the 53rd most populous combined statistical area and the 59th most populous primary statistical area of the United States as of July 1, 2012.
Government, policing, and politics
Pima County is governed by a five-member Board of Supervisors who set ordinances and run services for the areas that do not fall within any city or town jurisdiction.
Board of Supervisors and elected positions
The Pima County Board of Supervisors is responsible for steering public policy in the region. The five-member board provides direction to the County Administrator and the county's various departments as they work to ensure safe communities, nurture economic development, sustainably manage natural resources and protect public health. In addition to overseeing the delivery of a host of municipal services, from roads to parks and libraries and law enforcement, board members also are responsible for approving the county budget. Elected to four-year terms, board members also set the amount of taxes to be levied.
Party District Name First elected Area(s) represented Official Website
Republican District 1 Ally Miller 2012 Oro Valley, Marana, Catalina Foothills District 1
Democratic District 2 Ramon Valadez Appointed 2003 Tucson, Sahuarita, South Tucson District 2
Democratic District 3 Sharon Bronson 1996 Tucson, Marana, Three Points, Sahuarita District 3
Republican District 4 Steve Christy 2016 Tucson, Vail, Summerhaven, Green Valley District 4
Democratic District 5 Betty Villegas Appointed 2020 Tucson, Sahuarita, Green Valley District 5
Along with the Board of Supervisors the Arizona State Constitution allows for 7 other county elected officials.
Party Office Name First elected References
Democratic Assessor Bill Staples 2004
Democratic County Attorney Barbara LaWall 1996
Democratic County Recorder F. Ann Rodriguez 1992
Democratic County School Superintendent Dustin Williams 2016
Republican Sheriff Mark D. Napier 2016
Republican Treasurer Beth Ford 2000
Republican Clerk of Superior Court Toni Hellon 2013
Pima County sheriff
The Pima county sheriff's department provides court protection, administers the county jail, provides coroner service, and patrols the unincorporated parts of Pima County. It is the seventh largest sheriff's department in the nation. Incorporated towns within the county with municipal police departments are Tucson, Marana, Oro Valley, and Sahuarita.
Presidential elections results
Map of the incorporated and unincorporated cities and towns in Pima County. Also shown are the borders for the Indian Reservations in the county.
Astronaut photo of the open-pit copper mines adjacent to Green Valley, 2010. Note that north is to the left.
Tucson (county seat)
Marana (Partially in Pinal County)
Ghost Towns in Pima County
Ak Chut Vaya
List of Ghost Towns in Arizona
Corona de Tucson
Tohono O'odham (part)
County population ranking
The population ranking of the following table is based on the 2010 census of Pima County.
† county seat
Rank City/Town/etc. Population (2010 Census) Municipal type Incorporated
1 † Tucson 520,116 City 1775
2 Casas Adobes 66,795 CDP
3 Catalina Foothills 50,796 CDP
4 Oro Valley 41,011 Town 1974
5 Marana 34,961 Town 1977
6 Drexel Heights 27,749 CDP
7 Sahuarita 25,259 Town 1994
8 Green Valley 21,391 CDP
9 Tanque Verde 16,901 CDP
10 Flowing Wells 16,419 CDP
11 Tucson Estates 12,192 CDP
12 Vail 10,208 CDP
13 Picture Rocks 9,563 CDP
14 Valencia West 9,355 CDP
15 Catalina 7,569 CDP
16 Avra Valley 6,050 CDP
17 Corona de Tucson 5,675 CDP
18 South Tucson 5,652 City 1940
19 Three Points 5,581 CDP
20 Summit 5,372 CDP
21 Rincon Valley 5,139 CDP
22 Ajo 3,304 CDP
23 Sells 2,495 CDP
24 Arivaca Junction 1,090 CDP
25 Littletown 873 CDP
26 Arivaca 695 CDP
27 Pimaco Two 682 CDP
28 Santa Rosa 628 CDP
29 Elephant Head 612 CDP
30 Pisinemo 321 CDP
31 Topawa 299 CDP
32 Nelson 259 CDP
33 San Miguel 197 CDP
34 Gu Oidak 188 CDP
35 Why 167 CDP
36 Ali Chuk 161 CDP
37 Maish Vaya 158 CDP
38 Anegam 151 CDP
39 Cowlic 135 CDP
40 Ali Chukson 132 CDP
41 Wahak Hotrontk 114 CDP
42 South Komelik 111 CDP
43 Rillito 97 CDP
44 Haivana Nakya 96 CDP
45 Chiawuli Tak 78 CDP
46 Ali Molina 71 CDP
47 Charco 52 CDP
48 Ventana 49 CDP
49 Ko Vaya 46 CDP
50 Summerhaven 40 CDP
51 Nolic 37 CDP
52 Ak Chin 30 CDP
53 Comobabi 8 CDP
54 Willow Canyon 1 CDP
Pima County Fair
Locations of Interest
Arizona-Sonora Desert Museum
Old Tucson Studios
Arizona Historical Society (museum)
Tucson Gem & Mineral Show
Titan Missile Museum
Pima Air and Space Museum
Mission San Xavier del Bac
Kino Sports Complex (featuring Triple-A baseball and professional soccer team exhibitions)
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