It comes second in Laguna coming from Metro Manila next to San Pedro City.
The city covers a total land area of 43.50 km (16.80 sq mi) that represents 2.5 percent of the entire Laguna province. It is the fourth most populated in the province, (9.8% of the provincial population) next only to Calamba City (12.66%), San Pedro City (11.42%), and Santa Rosa City (9.92%).
With more than three-fourths of its area generally level to nearly level, this makes Biñan suitable for agricultural and urban development.
The climate of Biñan is characterized by two pronounced seasons; dry from November to April and wet during the rest of the year.
The other two basic soil series comprising Biñan are Guadalupe series covering 660 hectares and Lipa series with 798 hectares.
Biñan comprises 24 barangays, all classified as urban.
Maximum rainfall occurs from June to September with an annual average rainfall of 200 mm.