The area code 959 is located in Hartford, Connecticut.
Area code 959 serves Hartford, Connecticut, and much of central and eastern CT as an overlay to area code 860. It was activated in 2014 to add more phone numbers without changing existing lines, so 10‑digit dialing is standard across the region. Centered on Hartford—the state capital on the Connecticut River—the 959 area connects key government, business, and cultural hubs. Landmarks in the coverage area include the Connecticut State Capitol, the Mark Twain House & Museum, and the Connecticut Science Center.
Cities and towns covered by area code 959 (overlaying 860) include:
“Hartford is known as the ‘Insurance Capital of the World.’” — Encyclopaedia Britannica. Because 959 is an overlay, it shares the same footprint as 860, and no geographic boundaries changed when it launched—existing 860 numbers stayed the same. If you see a 959 phone number, the call typically comes from Hartford or surrounding towns in northern and eastern Connecticut. For residents and businesses, the overlay ensures a steady supply of local numbers while keeping the region’s calling identity intact.