Cacuaco is a city and one of the nine municipalities that make up the province of Luanda. A suburb of the capital, Luanda, it has a populati…Cacuaco is a city and one of the nine municipalities that make up the province of Luanda. A suburb of the capital, Luanda, it has a population of 1,279,488. It is served by a station on a branch line of the northern line of the national railway system.