Introduction: Iodine is one of the important trace element responsible for the human brain development and a spectrum of diseases. Iodine Deficiency Disorders (IDD) have been prevalent all over the world since many decades. The Government has introduced programs, by iodizing the salt to increase the uptake of Iodine, thereby trying to decrease the prevalence of the Iodine Deficiency Disorders (IDD). The current study was conducted with the objective to study the Knowledge, Attitude and Practice about iodised salt usage among mothers in the Urban areas of Kancheepuram District, Tamil Nadu. Methodology: The current study is a cross sectional study conducted in an Urban area where Simple random sampling technique was used and data was collected among 255 study participants. A structured questionnaire was used to collect data. Data was analyzed using SPSS 23. Results: The current study consisted mostly of women belonging to 20-60 years. Nearly 99% said that they use iodized salt while cooking. Ninety one percentage participants knew that thyroid is an important gland. Everyone (100% )knew that iodized salt was available in the market but however all did not know it is mandatory by the government. Eighty eight percentage participants had good knowledge, 92% had a positive attitude about the usage of iodized salt. Almost 99% had a Good practice in using iodized salt. Conclusion: Though almost everyone (99%) practised using iodized salt, they did not know the purpose of using iodised salt. So, it is the responsibility of the community workers, to impart the knowledge regarding the usage of iodized salt among mothers. So that we can achieve 100% iodised salt usage among mothers .