This study was conducted in the field of poultry in the Department of Animal Production, College of Agriculture, University of Diyala for the period from 1/10/2022 to 4/11/2022 in order to find out the effect of adding sodium citrate to drinking. Water on the Histological and microbial count of rose 308 broiler chickens reared at different densities. 405 day-old unsexed hybrid broiler birds, randomly distributed to nine treatments, with three replicates for each treatment, with three different densities and two different concentrations of sodium citrate were used. The results showed a significant (p≤0.05) superiority in Histological and microbial count of birds that were fed sodium citrate and reared at different densities. compared to the control treatment (without addition). An improvement was observed in Total and Lacto bacteria within the parts of the intestine represented by the duodenum, jejunum and ileum, as well as in the length and thickness of the villi and the depth of the crypts of the parts of the intestine represented by the duodenum, jejunum and ileum compared to the control treatment.