Google has changed the local search equation once again with a big update to its local listing pack. Last Thursday, Google began switching out its local 7-pack for a redesigned 3-pack, or Snack Pack. For all queries that produce a local pack, Google is now showing only three results instead of seven.

The new design eliminates some familiar data. Listings no longer include full addresses or phone numbers. Searchers can see the street name but must click through to the...