Passaic County. According to the U.S. Census Bureau, the county has a total area of 510 km² (197 mi²). 480 km² (185 mi²) of it is land and 30 km² (12 mi²) of it (5.97%) is water.

Passaic County is a county located in the U.S. state of New Jersey. As of the 2000 Census, the population was 489,049. Its county seat is Paterson6. It is part of the New York Metropolitan Area.

Passaic County was created in 1837 from portions of both Bergen County and Essex County.

The highest point is any one of six areas on Bearfort Ridge in West Milford Township at approximately 1,480 ft (451 m) above sea level. The lowest elevation is approximately 30 ft (9 m) along the Passaic River in Clifton.

The southeastern, more populous half of the county is either flat near the river or mildly hilly. The northwestern section is rugged and mountainous.

Passaic County Community College, founded in 1971, serves students from Passaic County at campuses in Paterson, Wanaque and Wayne.

William Paterson University is a public university located in Wayne, New Jersey. As of Fall 2005, there are 9,110 undergraduate students and 1,860 graduate students enrolled in the university.

Montclair State University is a public university located in Montclair, New Jersey, Little Falls, New Jersey, & Clifton, New Jersey. As of Fall 2004, there are about 9,600 full-time and 2,200 part-time undergraduate and 3,800 graduate students.