Rantauprapat is a city in North Sumatra province of Indonesia and it is the seat (capital) of Labuhan Batu Regency. Rantauprapat is also a name of village within the district of Rantau Utara (North Rantau). It consists of 3 main roads. A number of citizens move to larger cities like Medan in search for more job opportunities and/or universities. A large river named the Bilah River (a tributary of the Barumun River) runs through the town, which had 140,778 inhabitants at the 2010 Census, 170,462 at the 2020 Census, and 177,918 according to the official estimates as at mid 2023.

Rantauprapat was formerly an independent city situated within but administratively separate from Labuhan Batu Regency, but in 2003 its status of administrative city was erased as it did not fulfill the requirements for that status, and it was merged into the Regency, within which it now comprises two districts (North Rantau and South Rantau). These two districts (kecamatan) are tabulated below with their areas and their populations at the 2010 Census and 2020 Census, and the mid 2023 official estimates.

Name	Area in km	Population Census 2010	Population Census 2020	Population estimate mid 2023
Rantau Selatan (South Rantauprapat)	64.32	57,948	73,977	77,936
Rantau Utara (North Rantauprapat)	112.47	82,830	96,485	99,982

Rantauprapat has a tropical rainforest climate (Af) with heavy to very heavy rainfall year-round.

2°20′N 100°03′E / 2.333°N 100.050°E / 2.333; 100.050