adams_county,_pennsylvania | has to its west | franklin_county,_pennsylvania <tsp> adams_county,_pennsylvania | has to its southeast | carroll_county,_maryland <tsp> 11th_mississippi_infantry_monument | established | 2000 <tsp> adams_county,_pennsylvania | has to its north | cumberland_county,_pennsylvania <tsp> adams_county,_pennsylvania | has to its southwest | frederick_county,_maryland <tsp> 11th_mississippi_infantry_monument | location | adams_county,_pennsylvania <sep> adams county is a county in the commonwealth of pennsylvania as of the 2020 census, the population was 103,852 its county seat is gettysburg the county was created on january 22, 1800, from part of york county, and was named for the second president of the united states, john adams on july 1–3, 1863, a crucial battle of the american civil war was fought near gettysburg; adams county as a result is a center of civil war tourism 
adams county is located to the south of cumberland county and east of franklin county. carroll county maryland lies to the south east and frederick county to the southwest. the 11th mississippi infantry monument was established in the county in 2000.county pennsylvania county adams county pennsylvania