The 1991 census recorded Pure Thamman as having a total population of 588 people (293 male and 295 female), in 126 households and 126 physical houses. The area of the village was listed as 51 hectares. Members of the 0-6 age group numbered 121, or 21% of the total; this group was 57% male (69) and 43% female (52). Members of scheduled castes made up 20% of the village's population, while no members of scheduled tribes were recorded. The literacy rate of the village was 37% (156 men and 62 women). 192 people were classified as main workers (138 men and 54 women), while 17 people were classified as marginal workers (4 men and 13 women); the remaining 379 residents were non-workers. The breakdown of main workers by employment category was as follows: 162 cultivators (i.e. people who owned or leased their own land); 13 agricultural labourers (i.e. people who worked someone else's land in return for payment); 2 workers in livestock, forestry, fishing, hunting, plantations, orchards, etc.; 0 in mining and quarrying; 0 household industry workers; 4 workers employed in other manufacturing, processing, service, and repair roles; 0 construction workers; 1 employed in trade and commerce; 0 employed in transport, storage, and communications; and 10 in other services.
