Apple’s iPad hit store shelves on April 3, and if data from the online advertising firm Chitika is accurate, sales of the multimedia tablet have already topped a million units.

The company based its estimate on the number of iPads it has been tracking through its ad tracking system. Chitika has been using cookies to track iPad and to attempt to keep from tracking the same iPad more than once.

The data Chitika has been collecting also shows an interesting distribution of iPads around the United States. California tops the list with 19.12 percent of tracked iPads, New York comes in second with 8.3 percent, and Texas follows in third with 8 percent. North and South Dakota are near the tail end of the list with .14 percent and .13 percent respectively, Montana accounts for 0.08 percent of tracked iPads, and Wyoming comes in at the bottom of the list with 0.03 percent of the tracked iPads.

Apple reported selling over 300,000 iPads on the first day it was available, and sales topped 450,000 after five days. By April 14, Apple announced that over 500,000 iPads had been sold, and said that international sales would be delayed because of high demand in the U.S.

Apple hasn’t announced yet that it has topped a million iPad sales yet, so Chitika’s should be taken for what they are: estimates. Based on Apple’s official iPad sales numbers so far, however, an announcement that a million units have been sold can’t be too far away.

[This article has been updated with additional information about iPad distribution in the U.S.]