Original User: timw1984You have all the attribute fields in your output because when the 2 features overlap there would be 2 different values in for example your f_code field. Union creates a separate feature for every time your 2 input features overlap.You could use the merge tool if they don't overlap http://resources.arcgis.com/en/help/main/10.1/index.html#//001700000055000000