Intermarriage Peaks Up North

A recent story in The Forward reported that Portland, Maine, has the highest rate of intermarriage in the country.

While true, the number cited in the story–61%–is a little different than the number typically used when citing intermarriage rates. The most commonly cited intermarriage rate is the percentage of married Jews who are married to non-Jews (the individual intermarriage rate). The 61%, however, is the household (or couples) intermarriage rate, which is the percentage of households with Jews that are intermarriages. The household rate is always higher than the individual rate. In Portland, the individual rate is 44%–which is not quite as shocking as 61%.

To understand why the household rate is always higher than the individual rate, one need only realize that it takes two Jews to form an inmarried household and only one Jew to form an intermarried household. Therefore, when you are calculating the household rate, one intermarried Jew counts as much as two inmarried Jews. If you had 12 Jews in a community, and six were intermarried, the individual intermarriage rate would be 50%. However, because the six inmarried Jews all have to be married to other Jews, there are only three inmarried couples (because six people make three couples). But there are still six intermarried households. So the household intermarriage rate in this 12-person community would be 66%.

During the maelstrom over intermarriage that occurred after the release of the 1990 National Jewish Population Study, people were astonished that the reported intermarriage rate for the years 1995-2000 was 52% (a number which was since revised downward to 43%). But that was the individual intermarriage rate. Translated to a household rate, the national intermarriage rate for 1995-2000 would be an astonishing 68%!

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