Square in Java is called Alun-Alun. Alun-alun especially in Central Java has a unique pattern because of the historical factor. Karanganyar regency, Sukoharjo regency, and Klaten regency have alun-alun in the center of the city. The pattern of the alun-alun in these three regency was influenced by the development of the precolonial period, the Dutch colonial Period, and the post-independence period. Therefore, the first research objective is (1) to examine the comparison of current pattern in Karanganyar, Klaten, Sukoharjo in more depth. The three alun-alun built since the time of the Mataram Kingdom, now experiencing various developments, especially from the increasingly diverse functionality of the alun-alun and the addition of facilities to support the comfort and security in using the square. The second research objective is (2) to examine the comparison of Alun-Alun function in Karanganyar Regency, Sukoharjo Regency, and Klaten Regency. The last research objective is (3) to compare the accessibility of Alun-Alun in Karanganyar, Sukoharjo and Klaten Regency by using Indonesian Ministry of Public Works Regulation (Number: 30/PRT/M/2006). The research method used is the method of mapping to obtain the pattern data and function of the alun-alun and the method of comparison with the standard from Indonesia Ministry of Public Works Regulation to obtain data accessibility Alun-Alun in Karanganyar Regency, Sukoharjo Regency, and Klaten Regency. After the data of pattern, function, and accessibility in the three alun-alun is done the discussion, then compare the pattern, function, and accessibility of three alun-alun. The conclusion obtained that the alun-alun pattern in Karanganyar has a single surviving “Catur Tunggal” pattern compared to the alun-alun pattern in Klaten and Sukoharjo. Distribution of the function (economic, social, environment and health) of the alun-alun both alun-alun of Karanganyar, alun-alun of Sukoharjo, and alun-alun of Klaten mostly occurs on Sunday especially early in the morning when there is activity called as car free day. Accessibility at alun-alun of Klaten is more inclusive (accessible to all) than alun-alun of Karanganyar and alun-alun of Sukoharjo.