Here is an excerpt from a great post titled "Ten Ways to Love Where You Live" from the Abundant Community website:

For thousands of years, our ancestors lived in barrios, hamlets, neighborhoods, and villages. Yet in the time since our parents and grandparents were young, privacy has become so valued that many neighborhoods are not much more than houses in proximity.

Now, many activities take place behind locked doors and backyard privacy fences. The street out front is not always safe for pedestrians, and is often out of bounds for children. With families spread across the country and friends living across town, a person who doesn’t know their neighbors can feel isolated and insecure. And when the links among neighbors are weak, security relies on locks, gates, and guns, rather than a closely knit web of connections.  

Building a community from scratch is daunting. But the good news is that vibrant communities can grow over time from existing neighborhoods. Read more.

In conjunction with this post here is a very interesting resource called Nextdoor. It exists to help connect neighbors to build stronger communities.