Departments within the town's Planning and Land Use Department include: planning, zoning, conservation and inland wetlands, zoning board of appeals, historic district commission, economic development, design review and building inspection.
Killingworth is home to resident State Police Officer Matthew Ward.
The town is covered by State Police Troop F in Westbrook.
This office is one of the 17 field offices in the Boston region of the national Social Security Administration. Residents can access assistance in recieving and managing their Social and Supplemental Security benefits. Over 650,000 Connecticut residents recieve Social Security benefits, and this branch helps ensure that local residents can access and understand their benefits.