area (sq. miles) | county count | state count | span (miles) | span center | span end 1 | span end 2 |
| 1 | 18671 | 2 | 1 | 1 | 1 | 1 | 214 | Coconino-AZ (35.63, 111.64) | Coconino-AZ (34.26, 110.76) | Coconino-AZ (37.00, 112.54) |
| 2 | 9194 | 2 | 1 | 1 | 1 | 2 | 177 | Pima-AZ (32.13, 111.89) | Pima-AZ (32.51, 113.33) | Pima-AZ (31.73, 110.45) |
| 3 | 8894 | 2 | 1 | 1 | 1 | 4 | 138 | White Pine-NV (39.41, 114.93) | White Pine-NV (40.13, 115.83) | White Pine-NV (38.68, 114.05) |
| 4 | 6118 | 1 | 2 | 1 | 1 | 3 | 168 | Yakima-WA (46.73, 121.32) | Pierce-WA (47.40, 122.80) | Yakima-WA (46.04, 119.87) |
| 5 | 5072 | 2 | 1 | 1 | 1 | 8 | 101 | Hawaii-HI (19.62, 155.55) | Hawaii-HI (18.86, 155.68) | Hawaii-HI (20.32, 155.85) |
| 6 | 3814 | 2 | 1 | 1 | 1 | 7 | 106 | Culberson-TX (31.33, 104.47) | Culberson-TX (30.66, 104.92) | Culberson-TX (32.00, 104.02) |
| 7 | 3587 | 2 | 1 | 1 | 1 | 6 | 108 | Esmeralda-NV (37.71, 117.47) | Esmeralda-NV (38.47, 117.69) | Esmeralda-NV (36.97, 117.17) |
| 8 | 3248 | 2 | 1 | 1 | 1 | 10 | 83 | Duchesne-UT (40.31, 110.41) | Duchesne-UT (40.81, 109.98) | Duchesne-UT (39.81, 110.86) |
| 9 | 2786 | 2 | 1 | 1 | 1 | 5 | 112 | Pennington-SD (44.12, 102.99) | Pennington-SD (44.51, 102.00) | Pennington-SD (43.85, 104.06) |
| 10 | 2196 | 2 | 1 | 1 | 1 | 11 | 76 | Snohomish-WA (48.05, 121.72) | Snohomish-WA (48.17, 120.91) | Snohomish-WA (47.78, 122.44) |
| 11 | 1831 | 2 | 1 | 1 | 1 | 9 | 85 | Coos-NH (44.70, 71.21) | Coos-NH (44.09, 71.34) | Coos-NH (45.31, 71.08) |
| 12 | 1218 | 2 | 1 | 1 | 1 | 12 | 59 | Slope-ND (46.45, 103.49) | Slope-ND (46.63, 102.93) | Slope-ND (46.28, 104.05) |
| 13 | 953 | 2 | 1 | 1 | 1 | 14 | 44 | Kimball-NE (41.20, 103.72) | Kimball-NE (41.00, 104.05) | Kimball-NE (41.39, 103.38) |
| 14 | 552 | 2 | 1 | 1 | 1 | 13 | 46 | Reynolds-MO (37.51, 90.85) | Iron-MO (37.74, 91.15) | Iron-MO (37.27, 90.55) |
| 15 | 68 | 2 | 1 | 1 | 1 | 15 | 14 | City of Washington-DC (38.89, 77.04) | City of Washington-DC (38.79, 77.04) | City of Washington-DC (39.00, 77.04) |