The calculated distance (air line) between Shahrak-e Emām Ḩasan and Zanjān is approximately 179 miles respectively 288 kilometers.
By car or train, the actual journey to Zanjān is certainly longer, as only the direct route (as the crow flies) between Shahrak-e Emām Ḩasan and Zanjān has been calculated here.
Air line (approximately)
288 kilometers
155 nautical miles