This is probably not a coincidence - ancestors living next door to each other

Question

For some reason I had not entered a profile for my 4X Great Grandmother, Hancy P (Reynolds) Warren and I did so tonight.  I started wondering about census records I had missed.  So, searching on Hancy's 2nd husband's name, Charles Warren, I found the couple in 1870.  Right below them in the records in Mt. Vernon, Iowa, I found two very familiar names, Lewis and Louisa Murray.  They were my Great Great Grandparents and they were living next door.  It wouldn't be for another 30+ years that Hancy's great grandson, Leo Conrad would marry the Murrays' daughter Daisy.   Still, they had to have known each other and perhaps laid the foundation for their families to later combine. 

Answer 1

My family is Acadian. Grandfather William Guillaume Blanchard was born in Caraquet, New Brunswick, Canada; a descendant of Jean Blanchard (1611-c1686) and Radegonde Lambert. Grandmother Elizabeth Parise was born in the neighboring parish of Paquetteville.

The 1891 Census of Canada reveals the family of Daniel Blanchard and Francoise (Poirier) Blanchard, and the family of Francois Parisee and Philomen (Blanchard) Parisee were next door neighbors. Their children, William Guillaume Blanchard and Elizabeth Parisee were then 12 and 6 years old. On June 17,1907, Guillaume and Elizabeth married in Caraquet, New Brunswick, Canada. After the birth of their tenth and last child they moved their family to the unincorporated town of Rumford Falls, Maine, USA, in 1925.

Answer 2

Not a coincidence at all, esp. back a hundred and fifty years, before bicycles, people usually married withing walking distance unless they were wealthy enough to own horses.  In my line there is an instance of 5 siblings marrying 5 other siblings from the plantation next door.   My own parents lived on 2 farms that were only separated by a 40 acre tract that had no houses, they were some distance apart but were "next door" to each other.