| Ronkonkoma to Harrison (Ohio) | 625.66 mi (1,006.90 km) |
| Ronkonkoma to Harrison (Wisconsin) | 806.11 mi (1,297.31 km) |
| Ronkonkoma to Harrisonburg (Virginia) | 346.85 mi (558.19 km) |
| Ronkonkoma to Hartford (Connecticut) | 70.33 mi (113.19 km) |
| Ronkonkoma to Hartford (Wisconsin) | 800.34 mi (1,288.02 km) |
| Ronkonkoma to Hartselle (Alabama) | 873.10 mi (1,405.12 km) |
| Ronkonkoma to Hartsville (Tennessee) | 765.90 mi (1,232.60 km) |
| Ronkonkoma to Harvey (Illinois) | 756.31 mi (1,217.16 km) |
| Ronkonkoma to Harvey (Louisiana) | 1,213.00 mi (1,952.13 km) |
| Ronkonkoma to Hasbrouck Heights (New Jersey) | 49.80 mi (80.14 km) |
| Ronkonkoma to Haslett (Michigan) | 595.97 mi (959.11 km) |
| Ronkonkoma to Hastings (Minnesota) | 1,033.97 mi (1,664.02 km) |
| Ronkonkoma to Hastings (Nebraska) | 1,318.92 mi (2,122.60 km) |
| Ronkonkoma to Hattiesburg (Mississippi) | 1,114.38 mi (1,793.42 km) |
| Ronkonkoma to Hauppauge (New York) | 4.67 mi (7.52 km) |
