So the number of conservatives is the same there.
Apparently, conservatives are not interested in that field enough to pursue it. Going one step further, the number of liberals in academia outnumbers that of conservatives. a bit over 10 years ago economics professors, Christopher F. Cardiff and Daniel B. Klein, did a study of political affiliations of California professors and those seeking tenure. Basing the peoples leaning as left being democrat, and right being republican, they found that the ratio of Democrats in professorships out ranked that of Republicans 5:1. This included all departments, but when getting to specifics, the sociology department, D to R, ranked 44:1. Other departments have a closer mix, with the Humanities having a mix of 10:1 and business courses averaging a 1:1 ratio. While I point out that Liberty University has no sociology department, I find that surprising. Liberty, IIRC, is a very conservative school and considering that many of it's students may move on to religious careers, such an understanding of society and it's effects on others should be part of that curriculum. Two local universities, Notre Dame and Goshen College, are also Christian based schools, and have such departments. Notre Dame is a Catholic school while Goshen College is Mennonite. And yes, the Mennonites are a conservative people, but apparently, not as conservative as might be expected. They adhere strongly to the teachings of Christ, which are highly socialistic: Feed the hungry, house the homeless, heal the sick, protect the weak.
So it appears that conservatives in a sociology department is a rarity because they either lack the skills to teach this or chose other career paths instead.