There is one unique ZIP code in Foster, Oklahoma and it is 73434. Area code: 580.
1
ZIP codes
98.38
sq mi land
0.90
sq mi water
580
area code
Foster, OK ZIP code map
About Foster, OK
Foster is a small rural community located in Stephens County in south-central Oklahoma, served by the single ZIP code 73434. Nestled within the rolling plains and grasslands of the region, Foster embodies the quiet, tight-knit character of many small Oklahoma towns that have long depended on agriculture and the oil and gas industry. Though modest in size and population, Foster is part of a broader landscape rich in Oklahoma heritage, natural scenery, and the enduring spirit of the American frontier.
Location & geography
Foster sits in Stephens County in south-central Oklahoma, a region characterized by gently rolling terrain, open prairies, and scattered woodlands typical of the southern Great Plains. The community is located within reasonable driving distance of Duncan, the Stephens County seat, which lies to the northwest and serves as the region's main hub for commerce and services. The area covers a total land area of 98.38 square miles and a water area of 0.90 square miles, with small creeks and drainage features dotting the landscape and contributing to the region's agricultural productivity.
Community & economy
Foster reflects the close-knit, self-reliant character common to rural south-central Oklahoma communities, where neighbors know each other and local traditions run deep. The local economy has historically been tied to farming, ranching, and the oil and gas industry, all of which remain important parts of life in Stephens County. Daily life in and around Foster centers on agriculture, with residents often traveling to nearby Duncan or Lindsay for shopping, healthcare, and other services.
Transportation
Foster is accessible via rural state highways and county roads that crisscross Stephens County, connecting the community to larger regional thoroughfares. U.S. Highway 81 and State Highway 7 are among the key routes serving the broader area and providing access to nearby towns. The nearest commercial airport serving the region is the Chickasha Municipal Airport to the north and the Duncan Regional Airport closer to the county seat, while residents requiring major commercial air travel typically head to Will Rogers World Airport in Oklahoma City.
History
Stephens County, in which Foster is located, was established following the opening of Oklahoma Territory to settlement in the late nineteenth and early twentieth centuries, and small communities like Foster grew up to support the surrounding agricultural homesteads. The discovery of oil and gas in south-central Oklahoma during the early twentieth century brought additional economic activity to the region, shaping the character of Stephens County communities for generations. Foster, like many small Oklahoma towns, developed as a local gathering point for farming families in the surrounding countryside, serving the everyday needs of a hardworking rural population.
Did you know?
One lesser-known aspect of Foster and Stephens County is how the region sits atop significant oil-bearing geological formations that helped fuel Oklahoma's status as one of the nation's top oil-producing states during the mid-twentieth century. Despite its small footprint in the broader state, Foster's surrounding landscape of nearly 100 square miles of land speaks to the expansive, open character that defines rural Oklahoma and draws those who appreciate wide-open spaces and a slower pace of life.
