Los Angeles 2694
Galveston- Houston 2375
It is not clear whether these are the top six dioceses for Receptions, or whether they are the dioceses for which figures are readily available. The total for the six dioceses is 8990, and when one considers that there are about 200 dioceses in the USA, the figure for the nation as a whole must surely exceed 100,000.
I understand that the equivalent figure for England and Wales is in the region of 3,000, so the six listed US dioceses has about three times as many Receptions as the whole of England and Wales. To make a proper comparison, one would need to know the Catholic population of these dioceses, but , at first sight, it would seem that the USA is rather better at attracting converts.