AN IFR PA32 PLT MADE AN UNSCHEDULED LNDG WITH AN ILL PAX. HE DISCOVERED THE ARPT WAS NOTAMED CLOSED WHEN HE FILED TO HIS DEST.

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DEPARTED ZZZ1 ON IFR FLT TO ZZZ2; ABOUT 2 HR FLT. LEVELED AT 7000 FT AND WAS HANDED OFF FROM CTR TO ABC APCH. AT THAT POINT; MY SON (PAX) STARTED COMPLAINING OF INTESTINAL DISTRESS AND ASKED IF WE COULD LAND. GPS SHOWED ZZZ3 AS CLOSEST ARPT. I ADVISED APCH OF OUR SITUATION AND THEY ALSO POINTED OUT ZZZ3; BEHIND US BY ABOUT 4 MI. WE WERE ON TOP OF A SCATTERED LAYER WITH GOOD VISIBILITY UNDERNEATH SO I REQUESTED THE VISUAL TO ZZZ3. I WAS CLRED TO DSND TO 4000 FT DIRECT ZZZ3. CHKING ZZZ3 ASOS; WX WAS ABOUT 4000 FT BROKEN; 10 MI VISIBILITY. THERE WERE NO ADDITIONAL WARNINGS ON THE ASOS. BROKE OUT; CANCELED IFR AND SET UP FOR LNDG. THERE WAS 1 ACFT IN THE PATTERN; LANDED NORMALLY. NO X'S ON RWY; NO EQUIP WORKING ANYWHERE; NO SIGNS OR NOTES AT PLT LOUNGE. 2 MORE ACFT ARRIVED AND DEPARTED WHILE I WAS THERE. WHEN I CALLED FSS TO RE-FILE; THEY ADVISED ZZZ3 RWY WAS NOTAMED CLOSED. THE SPECIALIST CONTACTED THE CITY; WHO ADVISED THAT NOTAM SHOULD BE CANCELED. SPECIALIST SAID HE WOULD HAVE TO FILE A RPT SINCE I HAD LANDED AT A 'CLOSED' ARPT AND ASKED IF I HAD RECEIVED NOTAM. SINCE ZZZ3 WAS FAR ENOUGH FROM DEP AND DEST; I WAS UNAWARE OF CLOSURE. WHILE I UNDERSTAND MY RESPONSIBILITY TO OBTAIN ALL PERTINENT INFO PRIOR TO FLT; IT IS UNREASONABLE TO EXPECT THAT I HAVE THAT INFO FOR ANY POSSIBLE ARPT ALONG A 280 NM RTE.