Neighbouring districts are (from the northeast clockwise) Ban Laem, Khao Yoi, Ban Lat, and Tha Yang of Phetchaburi Province and the Bay of Bangkok.

The district is divided into 24 subdistricts (tambon),[1] which are further subdivided into 184 villages (muban).

The town (thesaban mueang) Phetchaburi covers tambons Tha Rap and Khlong Krachaeng.

There are two townships (thesaban tambon): Hat Chao Sam Ran covers tambon Hat Chao Sam Ran, and Hua Saphan covers Hua Saphan and Wang Tako.

The non-municipal area is administered by 18 tambon administrative organizations (TAO).