| Gaithersburg to Hutchinson (Minnesota) | 964.09 mi (1,551.55 km) |
| Gaithersburg to Hutto (Texas) | 1,292.79 mi (2,080.54 km) |
| Gaithersburg to Hyattsville (Maryland) | 18.32 mi (29.48 km) |
| Gaithersburg to Hybla Valley (Virginia) | 27.60 mi (44.41 km) |
| Gaithersburg to Idaho Falls (Idaho) | 1,818.51 mi (2,926.60 km) |
| Gaithersburg to Idylwood (Virginia) | 16.93 mi (27.25 km) |
| Gaithersburg to Ilchester (Maryland) | 24.52 mi (39.47 km) |
| Gaithersburg to Immokalee (Florida) | 911.27 mi (1,466.55 km) |
| Gaithersburg to Imperial (California) | 2,171.51 mi (3,494.71 km) |
| Gaithersburg to Imperial Beach (California) | 2,261.59 mi (3,639.67 km) |
| Gaithersburg to Independence (Kentucky) | 393.77 mi (633.72 km) |
| Gaithersburg to Independence (Missouri) | 917.37 mi (1,476.37 km) |
| Gaithersburg to Indian Trail (North Carolina) | 338.52 mi (544.80 km) |
| Gaithersburg to Indiana (Pennsylvania) | 145.48 mi (234.12 km) |
| Gaithersburg to Indianapolis (Indiana) | 478.40 mi (769.91 km) |
