Califon, NJ has a population of 1,340 and is the 13,363rd largest city in the United States. The population density is 1,398 per sq mi which is 139650% higher than the New Jersey average and 1442% higher than the national average. The median age in Califon is 42 which is approximately 7% higher than the New Jersey average of 40. In Califon, 70% of the population over 15 years of age are married, 98% speak English and 0% speak Spanish. 69% of Califon residents were born in New Jersey, 29% were born out of state, 0% were born outside of the United States and 2% were foreign born.