Zarcero is a district of the Zarcero canton, in the Alajuela province of Costa Rica. Zarcero was granted the title of "ciudad" by a law on 24 July 19…Zarcero is a district of the Zarcero canton, in the Alajuela province of Costa Rica. Zarcero was granted the title of "ciudad" by a law on 24 July 1918. Zarcero has an area of 11.72 km² and an elevation of 1,736 metres.