Valenzuela officially known as the City of Valenzuela is a highly urbanized, first-class city and one of cities in the Philippines that constitutes Metro Manila. The city has 568,928 residents as of August 2007 and is primarily an industrial and residential suburb of Manila. The North Luzon Expressway passes through the city and out of Metro Manila into the province of Bulacan. Valenzuela has a land area of 44.59 Square kilometers divided into several domain: residential, industrial and cultural. It is bordered by Meycauayan City, Quezon City and northern Caloocan City to the east; by Obando in Bulacan to the west; by Malabon City, southern Caloocan City and Tullahan River to the south. Since becoming a city in 1998, Valenzuelas economy has flourished and its population has swelled significantly.