Is there somewhere here on the net that will give instructions on what the measurements are for building a swallow apartment house?

Here is a site with Free Birdhouse Plans.

Judy, Here's some info on building apartment style birdhouses. They are usually made for purple martins.

Purple Martin Birdhouse Facts

Thank you so much Sherasi. I thought with the yard I had put in that I could eliminate the misquito problem. WRONG. I hate to spray for them because it kills so many of the helpful bugs but this is getting rediculous. I will put up with it this year but I thought I would try to get some swallows to come for a stay next year.

Thank you Jersey Tomater, I have enough of a yard to put up both Purple Martin apartment houses AND the ones for the swallows. I'm thinking of doing both.