Sex ratio is defined as the number of females per 1000 males. It is one of the important social indices to measure the prevailing inequality between males and females and regional imbalances in the status of women. The present paper based on the 1981, 1991 and 2001 census data, intends to examine the changing sex ratio in tribal population in comparison to non-tribal population in Dhule and Nandurbar districts of Maharashtra. It is found that the average sex ratio in the study area was 994 in 1981 which has increased to 995 in 1991 and 997 in 2001. It ranges from a maximum of 1013 in Akkalkuwa tahsil and minimum of 965 Shirpur tahsil in 1981 but in 1991 Nandurbar tahsil was identified with highest sex ratio (1015) and Dhule tahsil with lowest (897). In 2001 the maximum in Akkalkuwa tahsil (1021) and minimum sex ratio was found in Dhule tahsil (936). It is found that the sex ratio among the non-tribals is comparatively lower than the tribals. It is because of the fact that the feeling of having male issue is mainly confined to the non-tribal population, but the tribals don't find any difference between male and female child. The low tribal sex ratio in some talukas or districts is not because of getting rid of female child after having done sex determination, but in case of non-tribals, who are much advanced but in terms of feeling for the girl child lagging much behind as compared to the tribals. This sort of investigation can further bring grass-root realities at micro-level and with that solution for improvement of sex ratios in the lagging areas can be explicitly determined.