If you want OEM, find a dealer. If aftermarket is OK, then use an application guide. I've never seen a part number listed in an owners manual except for GM cars. My experience is limited though to a few cars.
Honda can be really convoluted with OEM part numbers. They'll use a different part number (depending on the supplier) for the same application. I haven't kept up with who they use, but back when I was getting filters for my Integra they included Toyo Roki (now Roki), Filtech (owned by Toyi Roki and now called Roki America), or Honeywell (Fram).