Counties serviced by this office:

Montana: Beaverhead, Big Horn, Blaine, Broadwater, Carbon, Carter, Cascade, Chouteau, Custer, Daniels, Dawson, Deer Lodge, Fallon, Fergus, Flathead, Gallatin, Garfield, Glacier, Golden Valley, Granite, Hill, Jefferson, Judith Basin, Lake, Lewis and Clark, Liberty, Lincoln, Madison, McCone, Meagher, Mineral, Missoula, Musselshell, Park, Petroleum, Phillips, Pondera, Powder River, Powell, Prairie, Ravalli, Richland, Roosevelt, Rosebud, Sanders, Sheridan, Silver Bow, Stillwater, Sweet Grass, Teton, Toole, Treasure, Valley, Wheatland, Wibaux, Yellowstone
Wyoming: Big Horn, Campbell, Crook, Hot Springs, Johnson, Park, Sheridan, Washakie, Weston

Cities serviced by this office:

Montana: Absarokee, Acton, Alberton, Alder, Alzada, Anaconda, Angela, Antelope, Arlee, Ashland, Augusta, Avon, Babb, Bainville, Baker, Ballantine, Basin, Bearcreek, Belfry, Belgrade, Belt, Biddle, Big Arm, Big Sandy, Big Sky, Big Timber, Bigfork, Bighorn, Billings, Birney, Black Eagle, Bloomfield, Bonner, Boulder, Box Elder, Boyd, Boyes, Bozeman, Brady, Bridger, Broadus, Broadview, Brockton, Brockway, Browning, Brusett, Buffalo, Busby, Butte, Bynum, Cameron, Canyon Creek, Capitol, Cardwell, Carter, Cascade, Charlo, Chester, Chinook, Choteau, Circle, Clancy, Clinton, Clyde Park, Coffee Creek, Cohagen, Colstrip, Columbia Falls, Columbus, Condon, Conner, Conrad, Cooke City, Coram, Corvallis, Crane, Crow Agency, Culbertson, Custer, Cut Bank, Dagmar, Darby, Dayton, De Borgia, Decker, Deer Lodge, Dell, Denton, Dillon, Divide, Dixon, Dodson, Drummond, Dupuyer, Dutton, East Glacier Park, East Helena, Edgar, Ekalaka, Elliston, Elmo, Emigrant, Ennis, Essex, Ethridge, Eureka, Fairfield, Fairview, Fallon, Fishtail, Flaxville, Florence, Floweree, Forestgrove, Forsyth, Fort Benton, Fort Harrison, Fort Peck, Fort Shaw, Fortine, Frazer, Frenchtown, Froid, Fromberg, Galata, Gallatin Gateway, Gardiner, Garneill, Garrison, Garryowen, Geraldine, Geyser, Gildford, Glasgow, Glen, Glendive, Glentana, Gold Creek, Grantsdale, Grass Range, Great Falls, Greenough, Greycliff, Hall, Hamilton, Hammond, Hardin, Harlem, Harlowton, Harrison, Hathaway, Haugan, Havre, Hays, Heart Butte, Helena, Helmville, Heron, Highwood, Hilger, Hingham, Hinsdale, Hobson, Hogeland, Homestead, Hot Springs, Hungry Horse, Huntley, Huson, Hysham, Ingomar, Inverness, Ismay, Jackson, Jefferson City, Joliet, Joplin, Jordan, Judith Gap, Kalispell, Kevin, Kila, Kinsey, Kremlin, Lake Mc Donald, Lakeside, Lambert, Lame Deer, Larslan, Laurel, Lavina, Ledger, Lewistown, Libby, Lima, Lincoln, Lindsay, Livingston, Lloyd, Lodge Grass, Lolo, Loma, Lonepine, Loring, Lothair, Malmstrom A F B, Malta, Manhattan, Marion, Martin City, Martinsdale, Marysville, Mc Allister, Mc Cabe, Mc Leod, Medicine Lake, Melrose, Melstone, Melville, Mildred, Miles City, Milltown, Missoula, Moccasin, Molt, Monarch, Moore, Mosby, Musselshell, Nashua, Neihart, Norris, Noxon, Nye, Oilmont, Olive, Olney, Opheim, Otter, Outlook, Ovando, Pablo, Paradise, Park City, Peerless, Pendroy, Philipsburg, Pinesdale, Plains, Plentywood, Plevna, Polaris, Polebridge, Polson, Pompeys Pillar, Pony, Poplar, Powderville, Power, Pray, Proctor, Pryor, Radersburg, Ramsay, Rapelje, Ravalli, Raymond, Raynesford, Red Lodge, Redstone, Reed Point, Reserve, Rexford, Richey, Richland, Ringling, Roberts, Rollins, Ronan, Roscoe, Rosebud, Roundup, Roy, Rudyard, Ryegate, Saco, Saint Ignatius, Saint Marie, Saint Regis, Saint Xavier, Saltese, Sand Coulee, Sand Springs, Sanders, Santa Rita, Savage, Scobey, Seeley Lake, Shawmut, Shelby, Shepherd, Sheridan, Sidney, Silver Gate, Silver Star, Simms, Somers, Sonnette, Springdale, Stanford, Stevensville, Stockett, Stryker, Sula, Sumatra, Sun River, Sunburst, Superior, Sweet Grass, Teigen, Terry, Thompson Falls, Three Forks, Toston, Townsend, Trego, Trout Creek, Troy, Turner, Twin Bridges, Two Dot, Ulm, Valier, Vandalia, Vaughn, Victor, Vida, Virginia City, Volborg, Warm Springs, West Glacier, West Yellowstone, Westby, White Sulphur Springs, Whitefish, Whitehall, Whitetail, Whitewater, Whitlash, Wibaux, Willard, Willow Creek, Wilsall, Winifred, Winnett, Winston, Wisdom, Wise River, Wolf Creek, Wolf Point, Worden, Wyola, Yellowtail, Zortman, Zurich
Wyoming: Aladdin, Alva, Arvada, Banner, Basin, Beulah, Big Horn, Buffalo, Burlington, Byron, Carlile, Clearmont, Cody, Cowley, Dayton, Deaver, Devils Tower, Emblem, Four Corners, Frannie, Gillette, Greybull, Hamilton Dome, Hulett, Hyattville, Kaycee, Kirby, Leiter, Linch, Lovell, Manderson, Meeteetse, Moorcroft, Newcastle, Osage, Otto, Parkman, Powell, Ralston, Ranchester, Recluse, Rozet, Saddlestring, Shell, Sheridan, Story, Sundance, Ten Sleep, Thermopolis, Upton, Wapiti, Weston, Wolf, Worland, Wright, Wyarno, Yellowstone National Park

Zip codes serviced by this office:

Montana: 59001, 59002, 59003, 59004, 59006, 59007, 59008, 59010, 59011, 59012, 59013, 59014, 59015, 59016, 59018, 59019, 59020, 59022, 59024, 59025, 59026, 59027, 59028, 59029, 59030, 59031, 59032, 59033, 59034, 59035, 59036, 59037, 59038, 59039, 59041, 59043, 59044, 59046, 59047, 59050, 59052, 59053, 59054, 59055, 59057, 59058, 59059, 59061, 59062, 59063, 59064, 59065, 59066, 59067, 59068, 59069, 59070, 59071, 59072, 59073, 59074, 59075, 59076, 59077, 59078, 59079, 59081, 59082, 59083, 59084, 59085, 59086, 59087, 59088, 59089, 59101, 59102, 59103, 59104, 59105, 59106, 59107, 59108, 59111, 59112, 59114, 59115, 59116, 59117, 59201, 59211, 59212, 59213, 59214, 59215, 59217, 59218, 59219, 59221, 59222, 59223, 59225, 59226, 59230, 59231, 59240, 59241, 59242, 59243, 59244, 59245, 59247, 59248, 59250, 59252, 59253, 59254, 59255, 59256, 59257, 59258, 59259, 59260, 59261, 59262, 59263, 59270, 59273, 59274, 59275, 59276, 59301, 59311, 59312, 59313, 59314, 59315, 59316, 59317, 59318, 59319, 59322, 59323, 59324, 59326, 59327, 59330, 59332, 59333, 59336, 59337, 59338, 59339, 59341, 59343, 59344, 59345, 59347, 59348, 59349, 59351, 59353, 59354, 59401, 59402, 59403, 59404, 59405, 59406, 59410, 59411, 59412, 59414, 59416, 59417, 59418, 59419, 59420, 59421, 59422, 59424, 59425, 59427, 59430, 59432, 59433, 59434, 59435, 59436, 59440, 59441, 59442, 59443, 59444, 59445, 59446, 59447, 59448, 59450, 59451, 59452, 59453, 59454, 59456, 59457, 59460, 59461, 59462, 59463, 59464, 59465, 59466, 59467, 59468, 59469, 59471, 59472, 59473, 59474, 59477, 59479, 59480, 59482, 59483, 59484, 59485, 59486, 59487, 59489, 59501, 59520, 59521, 59522, 59523, 59524, 59525, 59526, 59527, 59528, 59529, 59530, 59531, 59532, 59535, 59537, 59538, 59540, 59542, 59544, 59545, 59546, 59547, 59601, 59602, 59604, 59620, 59623, 59624, 59625, 59626, 59631, 59632, 59633, 59634, 59635, 59636, 59638, 59639, 59640, 59641, 59642, 59643, 59644, 59645, 59647, 59648, 59701, 59702, 59703, 59707, 59710, 59711, 59713, 59714, 59715, 59716, 59717, 59718, 59719, 59720, 59721, 59722, 59724, 59725, 59727, 59728, 59729, 59730, 59731, 59732, 59733, 59735, 59736, 59739, 59740, 59741, 59743, 59745, 59746, 59747, 59748, 59749, 59750, 59751, 59752, 59754, 59755, 59756, 59758, 59759, 59760, 59761, 59762, 59771, 59772, 59773, 59801, 59802, 59803, 59804, 59806, 59807, 59808, 59812, 59820, 59821, 59823, 59824, 59825, 59826, 59827, 59828, 59829, 59830, 59831, 59832, 59833, 59834, 59835, 59836, 59837, 59840, 59841, 59842, 59843, 59844, 59845, 59846, 59847, 59848, 59851, 59853, 59854, 59855, 59856, 59858, 59859, 59860, 59863, 59864, 59865, 59866, 59867, 59868, 59870, 59871, 59872, 59873, 59874, 59875, 59901, 59902, 59903, 59904, 59910, 59911, 59912, 59913, 59914, 59915, 59916, 59917, 59918, 59919, 59920, 59921, 59922, 59923, 59925, 59926, 59927, 59928, 59929, 59930, 59931, 59932, 59933, 59934, 59935, 59936, 59937
Wyoming: 82190, 82401, 82410, 82411, 82412, 82414, 82420, 82421, 82422, 82423, 82426, 82427, 82428, 82430, 82431, 82432, 82433, 82434, 82435, 82440, 82441, 82442, 82443, 82450, 82639, 82640, 82701, 82710, 82711, 82712, 82713, 82714, 82715, 82716, 82717, 82718, 82720, 82721, 82723, 82725, 82727, 82729, 82730, 82731, 82732, 82801, 82831, 82832, 82833, 82834, 82835, 82836, 82837, 82838, 82839, 82840, 82842, 82844, 82845