Yuma County is Arizona’s southwest border county. To the west is the State of California and to the south is Mexico. The Colorado River forms the County’s western border. Arizona’s two largest cities, Phoenix and Tucson, are in the 2 counties immediately east of Yuma. From the City of Yuma, the drive to Phoenix is about 3 hours. The drive to Tucson is about 4 hours. San Diego and the Southern California beaches along the Pacific Ocean are a 3 to 4 hour drive. Yuma County consists of approximately 5,522 square miles. Much of the area is open desert. The County’s population is concentrated in the vicinity of the City of Yuma, which is located on the Colorado River and is about a 30 minute drive to Mexico.

Yuma County has a year-round population of approximately 200,000 residents. During the winter, the population increases by about 90,000 due to the sun-seeking Winter Visitors affectionately known as "Snowbirds". Incorporated towns and cities within Yuma County are San Luis (city), Somerton (city), Wellton (town), and Yuma (city).  The sunny skies, low humidity and irrigation from the Colorado River have made the area not only the North American Winter Vegetable Capital, but also an agricultural research and education hub.  


Yuma County 213,787
City of Yuma 98,285
City of San Luis 34,778
City of Somerton 16,554
Town of Wellton 2,989

Click here for U.S. Census Bureau QuickFacts on Yuma County

Primary Industry

Industry $

Agriculture $3.3B
Military $900M
Tourism $664M
  • Yuma's industry and manufacturing base has grown steadily on both sides of the border (maquiladoras included) precipitating additional trade in the Yuma-Rio Colorado region.

  • We support two military bases: Marine Corps Air Station, Yuma (MCAS) and U. S. Army Yuma Proving Ground (YPG).

  • A local organization provides community support for our two military bases. For more information on this group, visit  

  • For specific economic development assistance, contact the Greater Yuma Economic Development Corporation (GYEDC) at (928) 782-7774.



  • On Interstate 8, more than 6.5 million vehicles per year (18,000 per day) pass through Yuma. At San Luis, another 2.6 million autos and 46,000 commercial vehicles cross annually.

  • Shoppers from Mexico contribute approximately $2.2 billion annually to Yuma County.

  • Yuma's annual sales continually show healthy increases compared to other parts of Arizona and the nation.

  • A Yuma business myth: As with many communities in Southwestern Arizona, Yuma's summer business seems to "die off". There is some truth to the story, but not much. In the slowest sales months of the year (June, July and August) the aggregate sales by Yuma businesses represents 22-24% of their annual sales.



  • Tax rates vary according to school district.
  • In Arizona, tax rates are stated in dollars per hundred of assessed value, rather than a mill rate like many other states. 
  • Assessed values are a fractional part of the full or limited value of the property with commercial property being assessed at an 18% assessment ratio while residential property is assessed at 10%. For example:
    • Assessed Value on a $500,000 commercial property would be $90,000.
    • Assessed Value on a $500,000 residential property would be $50,000.


Sales Tax Table


Yuma County 6.7% 6.7% 6.7%
City of San Luis 10.7% 10.7% 10.7%
City of Somerton 10% 10% 10%
City of Wellton 9.2% 9.2% 11.7%
City of Yuma 8.4% 10.4% 10.4%

 *Tax percentages figured from and  

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