C180 ATP RATED PLT LANDED OFF RWY IN GRASS AFTER NOTICING THE HARD SURFACE RWY X'ED CLOSED. HE LATER LEARNED THAT THE ENTIRE ARPT WAS NOTAMED CLOSED.

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DEPARTED HOME FIELD TO PICK UP FRIENDS AT 5R3; LAGO VISTA; TX. I HAD PRINTED THE ARPT CHART AND CHKED FOR ARPT NOTAMS ON THE COMMERCIAL CHART SVC I SUBSCRIBE TO. ON FINAL APCH TO RWY 18; I NOTICED A YELLOW 'X' ON THE RWY. I EXECUTED A GAR AND LOW PASS TO SURVEY THE FIELD. I ALSO CHKED THE NOTAMS AGAIN ON MY ONBOARD DATABASE. ONCE AGAIN; THERE WERE NONE. THE GRASS AREA OF THE ARPT THAT I USUALLY LAND ON APPEARED SUITABLE. MOST OF MY FLYING WITH THE C180 IS ON UNIMPROVED SURFACES. I LANDED ON THE UNIMPROVED SECTION; LOADED MY PAX AND DEPARTED WITHOUT ANY INCIDENT. UPON LNDG AT MY FINAL DEST; I CHKED THE FAA NOTAMS AND FOUND ONE FOR THE 'ARPT' BEING CLOSED. WITH THE INFO I HAD AT THE TIME; I ASSUMED JUST THE HARD SURFACE RWY WAS CLOSED -- NOT THE ENTIRE ARPT. AT NO TIME DID I OPERATE FROM THE RWY BEING RESURFACED. AFTER BECOMING AWARE OF THE COMPLETE STATUS OF THE ARPT; ON RETURN; I LANDED AT ANOTHER FACILITY AND SHUTTLED MY PAX TO THEIR CAR AT 5R3 BY CAR. I INFORMED COMMERCIAL CHART SVC OF THE OMITTANCE IN THEIR DATABASE. COMMERCIAL CHART SVC SAID THEY WOULD MAKE THE NOTAM CORRECTION -- EFFECTIVE AUG/MON/02.