There are 70 towns in Bergen County, and each has their own elementary district (some are K-12, others K-8, etc.) If you are working with a realtor, and have focused on different towns, the realtor can find out just what the deal is for each community. I can share with you that more communities are offering full-day kindergarten along with working parents programs or after-school childcare available for an additional fee. Pre-K programs are more scarce, with some programs more focused on at risk students or those with special needs. There are of course a large variety of privatge or parochial pre-K programs.
Teaneck, for instance, has full day public school kindergarten housed in one primary-based school, Bryant, along with Pre-K for about 80-100 students. Then the kids go on to one of three 1-4 schools depending on where they live in town. Teaneck also has a very good town-run full day pre-K program at their recreation center, partially subsidized by the town with the rest of the cost born by parents, and there are a number of other options either in houses of worship or privately run in Teaneck and surrounding communities.