Washington County was created on 1897 from Cherokee lands. The County was named for President George Washington. The County Seat is Bartlesville.
The county seat selected by delegates to the Constitutional Convention was Bartlesville, a town established in 1879 and named for Jacob Bartles, who had built a trading post on the site.
In 1913, after renting space for six years, county commissioners began work on a new county courthouse. Designed by architect P.H. Weathers, the work was completed by the Inland Construction Company at a cost of $94,750. The structure combined a unique mixture of architectural elements. The basic design was Second Renaissance Revival, with distinct horizontal zones, molded belt courses, rusticated stone finish on the ground level, and small fourth floor windows. Other elements of design included the colossal arch over the main entry, decorative touches of Neo-Classical architecture, and a sweeping staircase leading to the main entry.
In 1972 Washington County purchased the present county courthouse for $115,000 from the federal government, which had used it as a federal post office and court building. Built in 1933, the brick and granite structure was designed by architect James E. Wetmore.
The facade of the building was divided into two distinct zones, a lower level of smooth faced stone, the upper level of brick. This division was enhanced by unique window treatment and proportion. Other elements of design included the smooth ashlars quoins, the tiled roof, and the single dormer on the roof. See also County History for more historical details.
Counties adjacent to Washington County are Montgomery County, Kansas (north), Nowata County (east), Rogers County, Tulsa County (south), Osage County (west), Chautauqua County, Kansas (northwest)
Washington County Cities & Towns Include Bartlesville, Copan, Dewey, Ochelata, Ramona, Vera

All Departments below can be contacted at the Washington County Courthouse at 420 S Johnstone, Room 108, Bartlesville, OK 74003-6602; Phone: (918) 337-2820. NOTE: The record dates below are from the earliest date to present time.
Washington County Clerk's Office has Birth Records from 1908, Death Records from 1908 and , Land Records from 1900.
The County Clerk's office is responsible for preserving all the legal instruments filed by private citizens and public officials with the County Clerk's office. The office maintains files of all real estate records, plats, judgments, liens, patents, military discharges, school records, county personnel, insurance and retirement records for employees, meeting notices, commissioners' proceedings and other documents. Although county clerks record births and deaths and provide information on request, certificates are available only from the Vital Records Section, State Department of Health
Washington County Court Clerk's Office has Probate Records from 1907, Marriage Records from 1907, and Court Records from 1907.
The Court Clerk has the primary responsibility to record, file, and maintain permanent records of the proceedings of the District Court. We collect fines, fees, and forfeitures, and distribute the collected monies as provided by law to the appropriate agencies. There are numerous types of cases filed with the Court Clerk's Office some of which include: Civil, Small Claims, Probate, Guardianship, Adoption, Felony, Misdemeanor, Search Warrants, Licenses and more...
Washington County Tax Assessors Office, 420 S Johnstone, Room 108, Bartlesville, OK 74003-6602; Phone: (918) 337-2820
The county assessor has the responsibility to appraise and assess the real and personal property within the county for the purpose of ad-valorem taxation. Also, the county assessor is required to compute the ad-valorem taxes due on all the taxable property. By law, the county assessor appraises all the taxable real property according to its fair cash value for which the property is actually being used.
The county treasurer or assessor may have tax or assessment records. Some tax records are stored in museums, historical, and/or genealogical societies' repositories. Published tax records for Oklahoma are almost nonexistent. Some duplicated copies of county tax records are stored in the Oklahoma Department of Libraries, State Archives Division for security purposes, but are not available for research. Koplowitz, Guide to the Historical Records of Oklahoma, indicates location of county records, including those of tax and assessments.
Below is a list of online resources for Washington County Court Records. Email us with websites containing Washington County Court Records by clicking the link below:
Birth, marriage, and death records are connected with central life events. They are prime sources for genealogical information.
Vital Records Service, Oklahoma State Department of Health, 1000 Northeast 10th, Oklahoma City, OK 73117;(405) 271-4040, They have the following records:
Below is a list of online resources for Washington County Vital Records. Email us with websites containing Washington County Vital Records by clicking the link below:

Few, if any, records reveal as many details about individuals and families as do government census records. Substitute records can be used when the official census is unavailable
Countywide Records: Federal Population Schedules that exist for Washington County, Oklahoma are 1900, 1910, 1910, 1920 and 1940.There are free downloadable and printable Census forms to help with your research. These include U.S. Census Extraction Forms and U.K. Census Extraction Forms.
Below is a list of online resources for Washington County Census Records. Email us with websites containing Washington County Census Records by clicking the link below:
Below is a list of online resources for Washington County Military Records. Email us with websites containing Washington County Military Records by clicking the link below:
Below is a list of online resources for Washington County Genealogical Addresses. Email us with websites containing Washington County Genealogical Addresses by clicking the link below:
There are many churches and cemeteries in Washington County. Some transcriptions are online. A great site is the Washington County Tombstone Transcription Project.
Below is a list of online resources for Washington County Cemetery & Church Records. Email us with websites containing Washington County Cemetery & Church Records by clicking the link below:
Below is a list of online resources for Washington County Family Trees, web forums and other family type information. Email us with websites containing Washington County Family Trees, web forums and other family type information by clicking the link below: