Changes in Population by Counties in New Hampshire 



The counties of Carroll and Coos have changed little in population 

 numbers over the 30-year period 1920 to 1950. In contrast, Strafford and 

 Rockingham counties increased one third during this period. A comparison 

 of the numbers in each county for 1920 and 1950 is given in Table 10 to- 

 gether with the percentage change over this period. 



Table 10. New Hampshire County Populations for 1920 and 1950 

 and Percentage Change during This Period 



The influence of World War II and its after effects on employment and 

 mobility of population justifies separate observation of population changes 

 in the State which have occurred between 1940 and 1950. This is given in 

 Table 11. 



Rockingham and Strafford counties increased appreciably compared 

 with a loss in Coos and small 

 counties. 



gains in Carroll, Sullivan, and Merrimack 



Table 11. New Hampshire County Population for 1940 and 1950 

 end the Percentage Change during This Period 



Migration 



Accurate information on the migration of people in and out of the state 

 during any census period is not available. However, by using the natural 

 rate of increase during a ten-year period it is possible to estimate the prob- 

 able net migration in and out of counties. The natural rate of increase is 

 defined as the excess of births over deaths per 1,000 population. Therefore, 

 when the rate of population growth is less than the natural rate of increase, 

 we can assume an emmigration, and when it exceeds the natural rate we can 



