Walkscore lists seven attributes of walkable neighborhoods:
A center: Walkable neighborhoods have a center, whether it's a main street or a public space.
People: Enough people for businesses to flourish and for public transit to run frequently.
Mixed income, mixed use: Affordable housing located near businesses.
Parks and public space: Plenty of public places to gather and play.
Pedestrian design: Buildings are close to the street, parking lots are relegated to the back.
Schools and workplaces: Close enough that most residents can walk from their homes.
Complete streets: Streets designed for bicyclists, pedestrians, and transit.