| National League city: Abbr. | 27 |
| National League career home run king for more than 28 years | 59 |
| National leaders | 16 |
| National leader? | 16 |
| National leader from Georgia | 28 |
| National leader | 15 |
| National language of Pakistan | 29 |
| National Junior Tennis League co-founder | 40 |
| National Inventors' Day is observed on his birthday | 55 |
| National interest | 17 |
| National instruments of Guatemala | 33 |
| National Institutes of Health location | 38 |
| National Institutes of Health home | 34 |
| National Institutes of Health headquarters | 42 |
| National Institutes of Health city | 34 |
| National income source? | 23 |
| National Impotency mo. | 22 |
| National Immunization Program org. | 34 |
| National Iced Tea Month | 23 |
| National Humor Mo. | 18 |
| National HS exam | 16 |
| National home of many elite marathoners | 39 |
| National historical park in Alaska | 34 |
| National Historic Landmark in Manhattan | 39 |
| National Historic Landmark designated 3/27/06 | 45 |
| National highway | 16 |
| National hero of Spain | 22 |
| National hero of Hungary | 24 |
| National hero of Argentina | 26 |
| National hero | 13 |
| National headquarters of J.C. Penney, Dr Pepper and Frito-Lay | 61 |
| National head count | 19 |
| National Hamburger Month | 24 |
| National Guard soldiers | 23 |
| National Guard outpost | 22 |
| National Guard of the U.S. | 26 |
| National Guard hangout | 22 |
| National Guard concern | 22 |
| National Guard challenges | 25 |
| National Guard center | 21 |
| National Guard buildings | 24 |
| National Guard building | 23 |
| National Guard activity | 23 |
| National grp. since 1897 that elected its first male head in 2009 | 65 |
| National Geography Bee host | 27 |
| National Geographic's first natural one appeared in 1914 | 60 |
| National Geographic inserts | 27 |
| National Geographic Bee reference | 33 |
| National Geographic Bee host | 28 |
| National Geographic e.g. | 28 |
| National gemstone of Australia | 30 |
| National Gallery ___ | 20 |
| National Gallery __ | 19 |
| National Gallery of British Art, now | 36 |
| National Gallery of Art benefactor | 34 |
| National Gallery of Art architect | 33 |
| National Gallery exterior column type | 37 |
| National Gallery East Building designer | 39 |
| National Gallery architect I.M. __ | 34 |
| National Gallery architect | 26 |
| National frozen dessert chain | 29 |
| National forest in Utah | 23 |
| National forest in California | 29 |
| National Forest in Arizona | 26 |
| National Forensic League skill | 30 |
| National Football League award | 30 |
| National flower of Scotland | 27 |
| National flower of Mexico | 25 |
| National flower of India | 24 |
| National flower of England | 26 |
| National flower | 15 |
| National flags | 14 |
| National flag | 13 |
| National Fire Prevention Mo. | 28 |
| National Federation of Independent Business v. Sebelius matter | 62 |
| National Exposure Research Lab org. | 35 |
| National Examiner couple | 24 |
| National exam initials | 22 |
| National Enquirer topic, occasionally | 37 |
| National Enquirer rival | 23 |
| National Enquirer fodder | 24 |
| National Endowment for the ___ | 30 |
| National emblem of Wales | 24 |
| National emblem of Great Britain | 32 |
| National emblem of China | 24 |
| National emblem | 15 |
| National Economic Counsel director | 34 |
| National econ. yardstick | 24 |
| National econ. stat | 19 |
| National Dog Day mo. | 20 |
| National Do __ Call Registry | 28 |
| National Do Not Call Registry org. | 34 |
| National dish of Scotland | 25 |
| National discount store chain | 29 |
| National Dessert Mo. | 20 |
| National Dental Hygiene Mo. | 27 |
| National debt word | 18 |
| National debt unit | 18 |
| National debt figure | 20 |
| National day of gratitude, first observed by the Pilgrims in 1621 | 65 |