Castleton Four Corners, Vermont

The CDP is in northwestern Rutland County, in the southwest part of the town of Castleton. It is bordered to the east by Castleton village and to the west by the town of Fair Haven. Vermont Route 4A is the main road through the CDP; it leads east through Castleton village 9 miles (14 km) to West Rutland and west 3 miles (5 km) to Fair Haven village. Vermont Route 30 crosses Route 4A at Castleton Corners and leads north 29 miles (47 km) to Middlebury and south 6 miles (10 km) to Poultney. U.S. Route 4, a four-lane freeway, forms the northern edge of the CDP, with access from Exit 4 (Route 30). US 4 leads east 14 miles (23 km) to Rutland and west 12 miles (19 km) to Whitehall, New York.

The CDP is bordered to the south by the Castleton River, a west-flowing tributary of the Poultney River, which it joins at the New York state line on the west side of Fair Haven. The outlet of Lake Bomoseen, which flows south to the Castleton River, is in Hydeville. Castleton Four Corners is part of the Lake Champlain watershed.