In this post I estimate the number of men and women living in polygamy in Utah in 1880 using data from the 1880 census and other sources.
I have estimated that in 1880 there approximately 9,000 persons in polygamous marriages in Utah. About 6,500 wives and 2,500 husbands. This is approximately 25% of married Mormon women and about 13% of married Mormon men. However, the total number could easily be closer to 10,000.
I also conclude that the census data by itself is not sufficient for estimating the number of persons living in polygamy. Other data is required. This conclusion is based on the fact that the married female to married male ratio for Utah from the 1880 and 1900 census’ were outliers. However, in 1890 it was nearly 1.0 (Figure 4), which means that in 1890 nearly all women in polygamous relationships were concealing their marital status, probably to protect their husbands and children. I believe that in the 1880 census nearly two thirds of women in polygamous relationships concealed their marital status.
These results should be qualified with polygamy studies from Utah’s earlier history. It is appears that during the 1860’s quite possibly more than 50% of married LDS women in Utah were polygamous wives.