CMAP's data for the regional parking inventory is primarily focused on off-street facilities, but a more thorough collection of the region's on-street parking inventory is underway and will be analyzed in the context of traffic flow.
Northeastern Illinois has over 3.2 million off-street commercial and industrial parking spaces in more than 32,000 facilities. The average number of spaces at a facility is 85. O'Hare is the largest parking supplier with 28,800 spaces, and Joliet's Chicagoland Speedway has 20,800. Chicago office spaces account for 117,704, while downtown offices (including 4 neighborhoods around the Loop) number 75,335. The Loop (or Central Business District, bounded on the west and north by the Chicago River, on the east by Lake Michigan, and on the south by Roosevelt Road) has 59,188 spaces, of which 33,652 are office spaces. These numbers do not include spaces from Metra, CTA, or Pace (discussed in the following section).