U.S. Tri-State Corners

Arranged generally from west to east and numbered the same as in Jack Parsell's Tri-State Corners guide. There are two tri-points associated with the District of Columbia and to distinguish these I have labelled them 32N and 32S for the northern and southern points.

Key to Column Headings

States = The standard two character postal abbreviation for the three states. Counties = The counties listed in the same order as the states. Tri-Point Name = The name of the benchmark at the tri-point. If no BM name can be found then a PXXXX ft. is assigned from the elevation at the tri-point. If PXXXX m is shown then the topo map is metric. EL,ft = Elevation in feet. EL,m = Elevation in meters. EL = How the elevation is shown on the map. A BM entry indicates a brass survey monument or benchmark is at tri-point. Topo Map (7.5 min.) = The topo map the tri-point is on. Maps with an asterisk after the name are 7.5 X 15 min.

Note: The northern VA, DC, MD point is missing because I could not find the map. I hope to add this data soon.




Tri-Point Name




Topo Map (7.5 min)
1 OR, CA, NV Lake, Modoc, Washoe Boundary Post CA NV OR 5285 1611 BM Barrell Springs (NV)
2 OR, ID, NV Malheur, Owyhee, Humboldt Boundary ID OR NV 5274 1607 BM Star Valley Knoll (OR)
3 ID, NV, UT Cassia, Elko, Box Elder Three Corners 5233 1595 BM Nile Spring (NV)
4 NV, UT, AZ Lincoln, Washington, Mohave Boundary Initial Mon AZ NV UT 2703 824 BM Terry Benches (UT)
5 MT, ID, WY Gallatin, Fremont, Teton P8330 ft 8330 2539 Inter. Buffalo Lake NE (ID)
6 ID, UT, WY Bear Lake, Rich, Lincoln Boundary Cor ID UT WY BLM 7057 2151 BM Boundary Ridge (ID)
7 WY, UT, CO Sweetwater, Daggett, Moffat GLO 28 CO UT WY 8408 2563 BM Red Creek Ranch (WY)
8 UT, CO, AZ, NM San Juan, Montezuma, Apache, San Juan CO UT AZ NM 4866 1483 BM Teec Nos Pos (AZ)
9 MT, ND, SD Fallon, Bowman, Harding Boundary Mon 360M 3048 929 BM Snider Hill (MT)
10 MT, WY, SD Carter, Crook, Butte NE Corner Wyoming 3422 1043 BM Gravel Draw (WY)
11 WY, SD, NE Niobrara, Fall River, Sioux Chaffee Monument 3932 1198 BM Oat Creek (WY)
12 WY, NE, CO Laramie, Kimball, Weld Boundary Mon CO NE WY 5386 1642 BM Pine Bluff SE (WY)
13 CO, NE, KS Yuma, Dundy, Cheyenne Boundary Mon CO KS NE 3444 1050 BM Laird (CO)
14 CO, NM, OK Baca, Union, Cimarron Boundary MI Cor CO NM OK 4445 1355 BM Goodson School (NM)
15 NM, OK, TX Union, Cimarron, Dallam Texhomex 4714 1437 BM Rardin Hill (NM)
16 CO, KS, OK Baca, Morton, Cimarron Boundary Mon CO KS OK 3687 1124 BM Sturgis (OK)
17 ND, SD, MN Richland, Roberts, Traverse P970 ft 970 296 Inter. Boisberg (MN)
18 SD, MN, IA Minnehaha, Rock, Lyon P1410 ft 1410 430 Spot Valley Springs (MN)
19 KS, OK, MO Cherokee, Ottawa, Newton Boundary Mon KS MO OK 1024 312 BM Racine (MO)
20 OK, MO, AR Delaware, McDonald, Benton Boundary Mon AR MO OK 1129 344 BM Colcord NE (AR)
21 TX, AR, LA Cass, Miller, Caddo Parish Boundary Mon AR LA TX 226 69 BM Ravanna (TX)
22 IN, MI, OH Steuben, Hillsdale, Williams Ohio Mich Bdry Cor WP 1066 325 BM Clear Lake (IN)
23 TN, AL, GA Marion, Jackson, Dade SL 1 720 219 Inter. New Home (GA)
24 AL, FL, GA Houston, Jackson, Seminole P70 ft 70 21 Inter. Saffold (AL)
25 TN, NC, GA Polk, Cherokee, Fannin P1760 ft 1760 536 Inter. Mineral Bluff (GA)
26 NC, GA, SC Jackson, Macon, Oconee Ellicott Rock 2149 655 BM Cashiers (GA)
27 KY, VA, TN Bell, Lee, Claiborne Virginia Corner 2 Reset 1987 606 BM Middlesboro South (TN)
28 TN, VA, NC Johnson, Grayson, Ashe North Carolina Corner Reset 4628 1411 BM Grayson (TN)
29 KY, VA, WV Pike, Buchanan, Mingo P827 ft 827 252 BM Wharncliffe (WV)
30 PA, WV, MD Fayette, Preston, Garrett Mon 34 2320 707 Inter. Friendsville (MD)
31 MD, WV, VA Washington, Jefferson, Loudoun P260 ft 260 79 Inter. Harpers Ferry (VA)
32N VA, DC, MD Fairfax, DC, Montgomery VA, DC, MD 10 3 Inter. Washington West (MD)
32S VA, DC, MD Fairfax, DC, Prince Georges Boundry Mark 14 DC VA 8 2 BM Alexandria (VA)
33 PA, MD, DE Chester, Cecil, New Castle MDP Corner 255 78 BM Newark West (MD)
34 NY, PA, NJ Orange, Pike, Sussex Tri States 1942 420 128 BM Port Jervis South (NJ)
35 MA, NY, CT Berkshire, Dutchess, Litchfield Boundary Bound CT MA NY 2146 654 BM Ashley Falls (MA)*
36 VT, NY, MA Bennington, Berkshire, Rensselaer Boundary Bound MA NY VT 1417 432 BM Berlin (NY)*
37 VT, NH, MA Windham, Cheshire, Franklin P60 m 197 60 Inter. Northfield (MA)*
38 CT, MA, RI Windham, Worcester, Providence Tri State 630 192 BM Webster (MA)*