| Phihyŏn County | |
| Native Name Lang: | ko |
| Settlement Type: | County |
| Translit Lang1: | Korean |
| Translit Lang1 Type1: | Chosŏn'gŭl |
| Translit Lang1 Info1: | 피현군 |
| Translit Lang1 Type2: | Hancha |
| Translit Lang1 Info3: | P'ihyŏn-gun |
| Translit Lang1 Info4: | Pihyeon-gun |
| Mapsize: | 270px |
| Subdivision Type: | Country |
| Subdivision Name: | North Korea |
| Subdivision Type1: | Province |
| Subdivision Name1: | North P'yŏngan |
| Area Total Km2: | 439 |
| Population As Of: | 2008[1] |
| Population Total: | 110,637 |
| Population Density Km2: | auto |
| Parts Type: | Administrative divisions |
| Parts: | 1 ŭp, 2 workers' districts, 21 ri |
Phihyŏn County is a kun, or county, in northwestern North P'yŏngan province, North Korea. It is bounded to the north by Ŭiju, to the east by Chŏnma, to the south by Yŏmju and Tongrim, and to the west by Ryongchŏn and the large city of Sinŭiju. It was established as a separate county in 1952, and was subsequently reorganized in 1954, 1958, 1961, 1963, 1967 and 1978.
The land of Phihyŏn is generally flat in the west, rolling in the center, and rises to the low Munsu Mountains in the east. The chief of these peaks is Munsusan (문수산, 736 m). The chief local stream is the Samgyochŏn (삼교천), a tributary of the Yalu River. Forestland covers 57% of the county's area (of that, pine forests account for 80%); 31% of the county is cultivated.
Phihyŏn is divided into 1 ŭp (town), 2 rodongjagu (workers' districts) and 21 ri (villages):
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The year-round average temperature is 8.5 °C, dipping to a January mean of -9.5 °C and rising to 23.6 °C in August. The annual rainfall averages 1065 mm.
Crops raised on that cultivated land include rice, maize, soybeans, and sweet potatoes. Peanuts are also raised; Phihyon ranks second in the province in peanut production, and third in sheep production. The county is known for its hogs.
Phihyŏn is home to the Phihyŏn College of Land Administration.
The Phyŏngŭi (Pyŏngyang-Sinŭiju) and Paengma (Yŏmju-South Sinŭiju) lines of the Korean State Railway pass through the county.