In the classic Monopoly board game, the standard property set contains 28 properties, including railroads and utilities.
Those 28 properties consist of 22 colored street properties, four railroads, and two utilities. The colored streets are arranged into eight color groups, with groups containing either two or three properties. Railroads and utilities are not part of the colored street groups, but they are still purchasable properties.
This total is separate from the 40 spaces printed around the board. The remaining spaces include GO, Jail, Free Parking, Go to Jail, three Chance spaces, three Community Chest spaces, and two tax spaces. Thus, not every board space is a property that can be bought.
Some editions and themed versions alter names, artwork, or the board itself. The figure of 28 describes the classic standard layout, not every Monopoly spin-off or licensed edition.