This paper measures the evolution of the gap between the incomes of Francophones and those of Anglophones in the Ottawa-Hull area between 1970 and 1980. The data has been gathered on the basis of municipalities and census sectors, and allows comparisons of incomes of the two linguistic groups on the basis of municipalities or sectors. The computations cover the average total family income of a municipality or sector, and the proportion of Francophones living there. The unemployment rates are also observed. It is shown that linguistic economic disparities are still important in 1970. Overall, one must conclude that there has been a slight trend towards a reduction of these disparities.