| Rio Grande City to Kingsville (Texas) | 97.88 mi (157.52 km) |
| Rio Grande City to Kinston (North Carolina) | 1,397.30 mi (2,248.73 km) |
| Rio Grande City to Kirkland (Washington) | 1,942.05 mi (3,125.43 km) |
| Rio Grande City to Kirksville (Missouri) | 1,019.87 mi (1,641.33 km) |
| Rio Grande City to Kirkwood (Missouri) | 973.63 mi (1,566.90 km) |
| Rio Grande City to Kiryas Joel (New York) | 1,741.51 mi (2,802.69 km) |
| Rio Grande City to Kissimmee (Florida) | 1,075.47 mi (1,730.80 km) |
| Rio Grande City to Klamath Falls (Oregon) | 1,697.17 mi (2,731.34 km) |
| Rio Grande City to Knightdale (North Carolina) | 1,363.16 mi (2,193.80 km) |
| Rio Grande City to Knik-Fairview (Alaska) | 3,361.69 mi (5,410.12 km) |
| Rio Grande City to Knoxville (Tennessee) | 1,098.57 mi (1,767.98 km) |
| Rio Grande City to Kokomo (Indiana) | 1,214.81 mi (1,955.06 km) |
| Rio Grande City to Kuna (Idaho) | 1,538.50 mi (2,475.97 km) |
| Rio Grande City to Kyle (Texas) | 256.02 mi (412.02 km) |
| Rio Grande City to La Cañada Flintridge (California) | 1,273.44 mi (2,049.41 km) |
