Lanham is an unincorporated community in both Washington County, Kansas, and Gage County, Nebraska, United States. The Kansas–Nebraska state line runs down its main street. It is located along State Line Road, approximately 0.6 mile west of K-148/Nebraska Highway 112. It is also seven miles north of Hanover, Kansas, and 6.5 miles fr…Lanham is an unincorporated community in both Washington County, Kansas, and Gage County, Nebraska, United States. The Kansas–Nebraska state line runs down its main street. It is located along State Line Road, approximately 0.6 mile west of K-148/Nebraska Highway 112. It is also seven miles north of Hanover, Kansas, and 6.5 miles from Odell, Nebraska.