The county consists of 3 subdistrict offices, 12 towns, 7 townships, and 525 administrative villages (or community), with the population being approximately 1,430,000[when?]

The urban area expands very quickly, especially westwards, under the background of estate boom across China.

In the 6th year of Jiading of South Song Emperor Ningzong, also the 1st year of Zhining of Jin Emperor Weishao (1213 A.D.), the Huyang County was abolished and incorporated to Biyang (泌阳) County (now Tanghe) as Huyang Town, and belongs to Tangzhou State.

At this time, the Tangzhou State had no County to administrate at all, and belongs to the Jiangbei Road of Henan.

In the 2nd year of Hongwu (1369 A.D.) during the Ming dynasty, the Tangzhou State was abolished and set Tang County (govern the urban district of now Tanghe), belongs to Nanyang Fu.

In the 2nd year of the ROC (1913 A.D.), renamed the Biyuan (沘源) County, belongs to Yunan (South Henan) Road.

In the 21st year, changed and belongs to the Sixth District Chief Inspector of Henan Province.

In 1947 – 1948, the Tanghe (or Tangbei), Tangnan and Tangxi Counties in the territory, and all belongs to the First Patriotic Democratic Chief Inspector of Tongbai Region.

In the winter of 37th year of ROC, the Tanghe (Tangbei) County was changed and belongs to the Second Patriotic Democratic Chief Inspector of Tongbai Region.