Harford County, MD Building Setbacks & Zoning: Setback Rules (2026)

Unlike most Maryland Dillon's Rule counties, Harford holds home-rule zoning power and writes binding dimensional standards. In unincorporated communities like Fallston and Jarrettsville the county code governs directly, while Bel Air, Aberdeen, and Havre de Grace zone their own land. Section 267-55 sets minimum lot area, building setback from adjacent residential lot lines, lot width, and front, side, and rear yards for the R1 (15,000 to 20,000 square feet), R2 (7,500 to 10,000 square feet), and R3 (5,000 to 7,500 square feet) urban residential districts through Tables 55-1 through 55-4.3. The AG Agricultural and RR Rural Residential districts carry their own yard tables under Sections 267-53 and 267-54.