Benton County, Washington

Benton County

Benton County was founded on March 08, 1905 from Yakima County and Klickitat County. The county was named in honor of Thomas Hart Benton (1782–1858), a Missouri U.S. Senator.

The Benton County Seat is situated in Prosser and the county government website is

Locations bordering Benton County are Grant County (north), Franklin County (northeast), Walla Walla County (east), Umatilla County, Oregon (south), Morrow County, Oregon (south), Klickitat County (west), Yakima County (west).

Cities and towns found in Benton County consists of Benton City (2,624), Finley (5,770), Highland (3,388), Kennewick (67,180), Prosser (4,838), Richland (38,708), West Richland (8,385)

Early wagon roads from Walla Walla to Puget Sound also traversed the county. In the 1880s the coming of railroads brought settlers to the region and the irrigation projects of the 1890s created a rich agricultural economy. Today the county enjoys a diversified economy based on agriculture, wood products, food production and government installations.

Benton County vital records can be found at the Washington Office of Vital Records has copies of birth, marriage, divorce and death records. There is a fee for each copy requested. Please refer to the information to the Statewide Vital Records in Washington for current fees and application process.

You can search online for Benton County Birth, Marriage, Divorce or Death Records. You can also Order Electronically Online or can download an application for Washington Birth or Death Certificate and Marriage or Divorce Certificate Applications to mail.

Benton County has Federal Census Schedules to assist in researching your family tree. Federal government Population Schedules exist for 1910, 1920, 1930, 1940. You'll find free down loadable in addition to printable census forms that can help with your research.

Benton County Society and Family History Resources

A list of Benton County Historical  and Genealogical Societies, Forums, Message Boards, Libraries, Archives.

  • Washington Genealogy Network Community (
  • Washington State Genealogy Network (
  • Central Regional Branch—Washington State Archives, Central Washington University, MS-7547, Ellensburg, WA 98926-7547
  • Benton County Historical Society, Inc., PO Box 591, Prosser, WA 99350. Phone 509-786-3842.
  • East Benton County Historical Society, 205 Keewaydin Drive, PO Box 6964, Kennewick, WA 99336. Phone 509-582-7704. Operates the East Benton County Historical Museum.
  • Tri-city Genealogical Society, PO Box 1410, Richland, WA 99352-1410. Membership available. Tri-City Genealogical Society's holdings are located at the Richland Family History Center.
  • Washington State University Tri-Cities Library, Max E. Benitz Library, 100 Sprout Rd, Richland, WA; 99352-1643. Phone 509-372-7430. Fax 509-372-7281.
  • Benton/Franklin County Law Library, Columbia Basin College Library, 2600 N 20th Ave, Pasco, WA; 99301. Phone 509-547-0511 ext. 2290.
  • Kennewick Family History Center, 895 W Gage Blvd, Kennewick, WA. Phone 509-628-8332.
  • Prosser Family History Center, 1835 Highland Drive, Prosser, WA. Phone 509-786-3860.
  • Richland Family History Center, 1314 Goethals, Richland, WA 99352. Phone 509-946-6637.
  • Tri-City Herald Library, PO Box 2608, Tri Cities, WA 99302. Not generally open to the public.
  • Mid-Columbia Library, 4101 E Lattin Rd, West Richland, WA 99353. Phone 509-627-0285. Fax 509-545-2054. The following are branches of this library system:
    • Benton City Branch, 708 Ninth St, Box 369, Benton City, WA 99320. Phone 509-588-6471.
    • Kennewick Branch, 405 S Dayton, Kennewick, WA 99336-5690. Phone 509-586-3156.
    • West Benton Branch, 614 Sixth St, Prosser, WA 99350. Phone 509-786-3777. Fax 509-786-3777.
    • West Richland Branch, 3803 W Van Giesen, West Richland, WA 99353. Phone 509-967-3191.
  • Prosser Public Library, 902 7th St, Prosser, WA 99350-1454. Phone 509-786-2533. Collection includes northwest history materials and microfilm of local newspapers back to 1903.
  • Richland Public Library, 955 Northgate, Richland, WA 99352-3539. Phone 509-942-7450.
  • Benton County, Washington Message Boards ( read and post messages about your ancestors in Benton County
  • Benton County, Washington Genealogy Forum ( read and post messages with other genealogy researchers for Benton County
  • Washington State Digital Archives (
  • USGenWeb Archives for Benton County (

Benton County Courthouse and Government Records

Benton County Courthouse

Genealogist often forget the benefits of Benton County court, probate, and land files as a source of genealogy information and facts. Buried away in Washington courthouses and archives everywhere tend to be the desires and frustrations of countless Washington men and women.

The possibilities are great that your ancestors have left a in-depth record of at least a few factors of their lives in the Benton County court records. Even if your forebears is not discussed in a Court case, contemplate all of the other methods which could have lead to her or him appearing in court records.

The below specifics denotes exactly what death, marriage, birth, property, wills, and court records will be in Benton County. The dates pointed out below could be the first noted records for this particular county.

Please make sure to speak to the clerk's department to confirm hours, mailing address, fees and other details prior to visiting or seeking information because of sometimes changing contact information. The Department Offices DO NOT DO RESEARCH. The documents are accessible to interested parties, barring private issues. A lot of workers will help individuals in finding the resources, however it is up to the man or women to complete the research. Although originally held in the county seat, many county land, probate, and court records have been transferred to the state archive's regional branches.
  • Benton County Courthouse (all departments listed below are located here, unless otherwise noted)
    • Address: 620 Market St, Prosser, WA 99350
    • Courthouse hours: 8:00 am - 5:00 pm
  • Benton County Auditor has many responsibilities which include the recording of real property documents such as deeds and other recorded documents, issuing various licenses such as marriage liscense.
    • Birth and Death Records: 1905 to 1907 
    • Marriage Records: 1905 
    • Land Records: 1885
  • Benton County Clerk is the administrator of the Superior Court Clerk's Office. The Clerk's Office is responsible for keeping the permanent records of all cases filed in Superior Court. The type of cases filed are felony criminal cases, civil lawsuits, petitions for protection from domestic violence, family law matters (dissolutions 3rd Party Custody, parenting plans, modifications) probates, guardianships, Last Will & Testaments, paternities, adoptions and mental commitments. Bring as much information as possible, e.g. names of parties, type of action, approximate time frame. Most records are on microfilm. Copy charge is $1 per page. There is a search fee if the office does the searching. Requests for research must be in written form with check payable to Benton County Clerk. Policy is to collect fees in advance. For judicial purposes, many of the Washington counties were attached to other counties.
    • Court Records: 1884 
    • Probate Records: 1884 
  • Benton County Treasurer is the property tax collector for the County. Property Taxes are levied on the property by the various taxing authorities based on the valuation and current property usage as set by the Assessor's Office.
  • The Benton-Franklin Health District can issue Birth, Marriage and Death certificates while you wait.

Benton County Links

The following are links to Family history and genealogy, Records and Resources pertaining to Benton County. Most of these genealogy links fall into 3 categories: Commercial Sites, Private Sites or Organization Sites. Some have free access some require a fee. This is simply a directory that has been gathered or submitted. I do not endorse or promote one genealogy site above another. Feel free to present your own favorite Benton County genealogy or family history affiliated sites.

Benton Co. WA Books, Newspapers & Publications

Benton Co. WA Birth, Marriage & Death Records

Benton Co. WA Court, Probate Land and Tax Records

Benton Co. WA Census Records

Benton Co. WA Church & Cemeteries

Benton Co. WA Family Websites, Pictures & Histories

Benton Co. WA General and History Websites

Benton Co. WA Immigration & Naturalization

Benton Co. WA Maps, Atlases & Gazetteers

Benton Co. WA Military Records

Benton Co. WA Schools & Directories

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