In this study, electrical field strength (E) level measurements were conducted in indoor and outdoor at seven hospitals in the city center of Samsun/Turkey. E measurements were made with Narda SRM-3006 electromagnetic field meter, which can measure the frequency band between 30 MHz and 3 GHz selectively. Measurements results show that the highest E value within the hospital is 0.818 V/m, while this value is 2.627 V/m for out of hospital. The E exposed outdoor of the hospital is 2.93 times higher than indoor of the hospital for measurement locations. The main sources of total E in the environments are base stations, and their contributions are 92.5% and 98.6% for indoor and outdoor of the hospital respectively. The most contribution of 53.4% total E is base stations using 2100 MHz frequency.