Purpose of this study was to find out the Customer Satisfaction towards a Service at the Branch of Big C Supercenter in Nakhonpathom Province and compare it with personal data. Research instruments used was questionnaire. The samples consisted of 400 customers. Statistics employed here was mean, standard deviation, t-test and F-test respecticely. The results had been found that 76.8% were female, 62.5% were age between 20 – 34 years, 52.5% were bachelor degree holders, 48.5% were private officers and 31.0% had income less than 10,000 baht. Besides, customers were extremely satisfied through product, price, place and promotion. However, customer satisfaction toward service promotion was in average. Additionally, for hypothesis testing of customer satisfaction toward product and service, a significant difference at .05 level was found among customers who had different sex, age and income respectively. Specifically, a significant difference at .05 level in different customer satisfaction toward different product and service, price, place and promotion was found among customers whose difference in education. Finally, no significant difference was found among customers whose difference in occupation.