We are considering buying a house in a suburban Philadelphia neighborhood that has a large Jewish population (we are not Jewish)and are wondering if we would be welcome there. Are there special considerations we should be aware of when meeting and interacting with Jewish neighbors, taking into consideration Jewish law? For example, my wife said hello to a man walking with his children, but he did not respond to her, and we were told it was a law that men should not talk to women they do not know who are not part of their family. Are there some basic rules we should know?
You can choose to live wherever you want to buy/rent a house with all our Blessings. It is not our country and we are grateful for citizens like Yourself who respect our rights to live in exile in the USA. In our prayers every Sabbath,we Bless the "Kingdom of kindness" for giving us equal rights living among the kind Gentile citizens like yourselves.
With regards to how to act with your neighbors, there are varying walks of Judaism adhering to varying standards and you will learn with time how to interact with them and recognize different levels of Orthodoxy among the Jewish neighbors. Even then a smile always makes someone else's day and if they smile back that's great, If they nod they're still uplifted, and even if they don't respond its not a Defect with in yourselves G-d forbid, it could be they are just unsure what to do having not been used to smiles from others. What do we loose to judge others favorably! Though the mixing of genders might not be so prevalent among those who wear black and white for their strict religious adherence, they will still be courteous.
You will notice that on the Sabbath you might be in demand occasionally (not often, you don't need to disturb your routine at all for such errands) to come turn on the heating for families who's heating switched off accidentally, when you meet the rabbi i'm sure he'll give you a pep talk about such things.
Don't worry soon enough you will have expertise yourselves in how to live among Jews so with Blessings from all readers of this website have much success in your endeavors.