| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| CIA (CIAMPINO) | airport | Italy | 41.80 | 12.59 | 427 | 0 | |
| CIA HEADQUARTERS | airport | United States | 38.95 | -77.15 | 255 | 0 | |
| CIAMPINO | airport | Italy | 41.80 | 12.59 | 427 | 0 | |
| CIANORTE | airport | Brazil | -23.69 | -52.64 | 1837 | 0 | |
| CIBA-GEIGY | airport | United States | 41.12 | -74.13 | 310 | 0 | |
| CIBAO INTL | airport | Dominican Republic | 19.41 | -70.60 | 565 | 0 | |
| CIBECUE | airport | United States | 34.00 | -110.44 | 5037 | 0 | |
| CIBEUREUM | airport | Indonesia | -7.35 | 108.25 | 1148 | 0 | |
| CIBOLO CREEK RANCH | airport | United States | 29.89 | -104.26 | 4400 | 0 | |
| CIBOLO SEA-WILLO AIRPARK | airport | United States | 29.43 | -98.13 | 517 | 0 | |
| CIBRASA | airport | Brazil | -1.23 | -47.20 | 174 | 0 | |
| CIC | city | Parana | Brazil | -25.46 | -49.38 | 3349 | 239209 |
| CIC (CHICO MUNI) | airport | United States | 39.80 | -121.86 | 238 | 0 | |
| CICUCO | airport | Colombia | 9.27 | -74.65 | 65 | 0 | |
| CID (THE EASTERN IOWA) | airport | United States | 41.88 | -91.71 | 869 | 0 | |
| CIDER FIELD | airport | United States | 40.61 | -76.28 | 770 | 0 | |
| CIE (Collie Airport) | airport | -33.37 | 116.22 | 818 | 0 | ||
| CIELO DORADO ESTATES | airport | United States | 31.91 | -106.64 | 3750 | 0 | |
| CIELO GRANDE RANCH | airport | United States | 30.19 | -99.27 | 2180 | 0 | |
| CIF (Chifeng Airport) | airport | 42.24 | 118.91 | 0 | |||
| CIFI Airport | airport | -15.63 | -55.99 | 644 | 0 | ||
| CIG (CRAIG MOFFAT) | airport | United States | 40.50 | -107.52 | 6193 | 0 | |
| CIG 402 | airport | United States | 27.26 | -98.09 | 110 | 0 | |
| CIG 804 | airport | United States | 28.31 | -97.05 | 24 | 0 | |
| CIG 806 | airport | United States | 28.62 | -96.68 | 24 | 0 | |
| CIG 809 | airport | United States | 28.98 | -96.03 | 53 | 0 | |
| CIG 816 | airport | United States | 29.86 | -94.70 | 23 | 0 | |
| CIGLI | airport | Turkey | 38.51 | 27.01 | 16 | 0 | |
| CIH (Changzhi Airport) | airport | 36.25 | 113.13 | 0 | |||
| CII (Çıldır Airport) | airport | 37.81 | 27.90 | 102 | 0 | ||
| CIJ (HEROES DEL ACRE) | airport | Bolivia | -11.04 | -68.78 | 892 | 0 | |
| CIK (CHALKYITSIK) | airport | United States | 66.65 | -143.74 | 544 | 0 | |
| CIL (COUNCIL) | airport | United States | 64.90 | -163.70 | 85 | 0 | |
| CIM (Cimitarra Airport) | airport | 6.37 | -73.97 | 740 | 0 | ||
| CIMARRON MUNI | airport | United States | 37.83 | -100.35 | 2752 | 0 | |
| CIMARRON STRIP | airport | United States | 36.18 | -96.55 | 920 | 0 | |
| CIN (ARTHUR N NEU) | airport | United States | 42.05 | -94.79 | 1204 | 0 | |
| CINCINNATI BLUE ASH | airport | United States | 39.25 | -84.39 | 856 | 0 | |
| CINCINNATI MUNI LUNKEN FLD | airport | United States | 39.10 | -84.42 | 483 | 0 | |
| CINCINNATI NORTHERN KENTUCKY INTL | airport | United States | 39.05 | -84.67 | 896 | 0 | |
| CINCINNATI WEST | airport | United States | 39.26 | -84.77 | 584 | 0 | |
| CINCO B RANCH | airport | United States | 29.79 | -99.26 | 1457 | 0 | |
| CINDER BUTTE | airport | United States | 44.32 | -121.19 | 2950 | 0 | |
| CINDY GUNTLY MEMORIAL | airport | United States | 42.82 | -88.09 | 790 | 0 | |
| CIO (TENIENTE COL CARMELO PERALTA) | airport | Paraguay | -23.44 | -57.43 | 253 | 0 | |
| CIP (Chipata Airport) | airport | -13.56 | 32.59 | 3360 | 0 | ||
| CIPA Olimar | city | Treinta y Tres | Uruguay | -33.23 | -53.90 | 22 | 199 |
| CIPA Secador | city | Treinta y Tres | Uruguay | -33.21 | -53.90 | 26 | 149 |
| CIPA-Cebollatí | city | Treinta y Tres | Uruguay | -33.39 | -54.13 | 45 | 149 |
| CIQ (Chiquimula Airport) | airport | 14.83 | -89.52 | 1484 | 0 | ||
| CIRCLE 'A' RANCH | airport | United States | 32.13 | -97.40 | 608 | 0 | |
| CIRCLE 8 RANCH | airport | United States | 39.33 | -104.55 | 6650 | 0 | |
| CIRCLE A RANCH | airport | United States | 45.79 | -89.73 | 1640 | 0 | |
| CIRCLE BAR RANCH | airport | United States | 31.30 | -89.98 | 420 | 0 | |
| CIRCLE C | airport | United States | 41.04 | -80.98 | 1042 | 0 | |
| CIRCLE CITY /NEW/ | airport | United States | 65.83 | -144.08 | 613 | 0 | |
| CIRCLE EIGHT RANCH | airport | United States | 32.24 | -97.90 | 800 | 0 | |
| CIRCLE G | airport | United States | 32.01 | -91.76 | 75 | 0 | |
| CIRCLE H RANCH | airport | United States | 31.50 | -109.39 | 4680 | 0 | |
| CIRCLE HOT SPRINGS | airport | United States | 65.49 | -144.61 | 956 | 0 | |
| CIRCLE K | airport | United States | 45.34 | -89.67 | 1500 | 0 | |
| CIRCLE K RANCH | airport | United States | 43.14 | -74.12 | 920 | 0 | |
| CIRCLE L RANCH | airport | United States | 37.72 | -118.08 | 4835 | 0 | |
| CIRCLE M RANCH | airport | United States | 29.83 | -96.51 | 340 | 0 | |
| CIRCLE P | airport | United States | 30.10 | -83.45 | 83 | 0 | |
| CIRCLE P FARM | airport | United States | 34.75 | -76.91 | 30 | 0 | |
| CIRCLE P RANCH | airport | United States | 29.10 | -98.22 | 500 | 0 | |
| CIRCLE P RANCH | airport | United States | 32.24 | -97.88 | 800 | 0 | |
| CIRCLE R RANCH | airport | United States | 32.14 | -95.97 | 395 | 0 | |
| CIRCLE S FARMS | airport | United States | 36.23 | -94.03 | 1200 | 0 | |
| CIRCLE T | airport | United States | 33.21 | -83.91 | 545 | 0 | |
| CIRCLE T | airport | United States | 45.68 | -92.69 | 895 | 0 | |
| CIRCLE TOWN CO | airport | United States | 47.42 | -105.56 | 2426 | 0 | |
| CIRCLE U | airport | United States | 43.49 | -82.62 | 729 | 0 | |
| CIRCLE W AIRFIELD | airport | United States | 39.96 | -76.97 | 460 | 0 | |
| CIRCLE Z LANDING STRIP | airport | United States | 47.47 | -101.22 | 2000 | 0 | |
| CIRCUS CIRCUS | airport | United States | 36.14 | -115.17 | 2122 | 0 | |
| CIRINO | airport | United States | 39.89 | -105.09 | 5380 | 0 | |
| CIRINO | airport | United States | 41.44 | -81.33 | 1250 | 0 | |
| CIRQUE LODGE STUDIO | airport | United States | 40.31 | -111.67 | 4860 | 0 | |
| CIS (CANTON) | airport | Kiribati | -2.77 | -171.71 | 9 | 0 | |
| CISCO MUNI | airport | United States | 32.42 | -99.00 | 1612 | 0 | |
| CISZAK | airport | United States | 42.51 | -78.74 | 1397 | 0 | |
| CIT (SHYMKENT) | airport | Kazakhstan | 42.36 | 69.48 | 1385 | 0 | |
| CITABRIAIR | airport | United States | 37.64 | -113.25 | 5600 | 0 | |
| CITIZENS BANK HEADQUARTERS | airport | United States | 39.09 | -76.90 | 312 | 0 | |
| CITIZENS MEDICAL CENTER | airport | United States | 32.08 | -92.09 | 190 | 0 | |
| CITIZENS MEDICAL CENTER | airport | United States | 28.81 | -96.98 | 95 | 0 | |
| CITRUS HEDGING RANCH | airport | United States | 27.33 | -80.74 | 60 | 0 | |
| CITY | airport | United Kingdom | 54.62 | -5.87 | 15 | 0 | |
| CITY | airport | United Kingdom | 51.51 | 0.06 | 19 | 0 | |
| CITY CENTRE | airport | Canada | 43.63 | -79.40 | 251 | 0 | |
| CITY CO | airport | United States | 44.67 | -121.16 | 2437 | 0 | |
| CITY HALL | airport | United States | 34.05 | -118.24 | 360 | 0 | |
| CITY HALL | airport | United States | 33.98 | -117.38 | 977 | 0 | |
| CITY HALL COMPLEX | airport | United States | 36.17 | -115.14 | 2000 | 0 | |
| CITY HOSPITAL, INC. | airport | United States | 39.48 | -77.98 | 548 | 0 | |
| CITY NATIONAL BANK | airport | United States | 34.05 | -118.25 | 453 | 0 | |
| CITY NATIONAL PLAZA | airport | United States | 34.05 | -118.26 | 980 | 0 | |
| CITY OF COALGATE | airport | United States | 34.53 | -96.23 | 615 | 0 | |
| CITY OF COLORADO SPRINGS MUNI | airport | United States | 38.81 | -104.70 | 6187 | 0 | |
| CITY OF FAITH | airport | United States | 36.04 | -95.95 | 624 | 0 | |
| CITY OF FORT LAUDERDALE | airport | United States | 26.12 | -80.14 | 6 | 0 | |
| CITY OF FORT WORTH | airport | United States | 32.78 | -97.33 | 538 | 0 | |
| CITY OF HIGHLAND PARK | airport | United States | 42.20 | -87.83 | 640 | 0 | |
| CITY OF INDUSTRY CIVIC FINANCIAL CENTER | airport | United States | 34.02 | -117.96 | 322 | 0 | |
| CITY OF LAS ANIMAS BENT CO | airport | United States | 38.05 | -103.24 | 3915 | 0 | |
| CITY OF TULIA SWISHER CO MUNI | airport | United States | 34.57 | -101.78 | 3503 | 0 | |
| CIU (CHIPPEWA CO INTL) | airport | United States | 46.25 | -84.47 | 800 | 0 | |
| CIUDAD ACUNA INTL NEW | airport | Mexico | 29.33 | -101.10 | 1410 | 0 | |
| CIUDAD BOLIVAR | airport | Venezuela | 8.12 | -63.54 | 197 | 0 | |
| CIUDAD CAMARGO SOUTHEAST | airport | Mexico | 27.60 | -105.10 | 4265 | 0 | |
| CIUDAD CONSTITUCION | airport | Mexico | 25.05 | -111.61 | 213 | 0 | |
| CIUDAD DEL CARMEN INTL | airport | Mexico | 18.65 | -91.80 | 10 | 0 | |
| CIUDAD GUZMAN | airport | Mexico | 19.71 | -103.49 | 4987 | 0 | |
| CIUDAD LIBERTAD | airport | Cuba | 23.09 | -82.44 | 98 | 0 | |
| CIUDAD OBREGON INTL | airport | Mexico | 27.39 | -109.83 | 205 | 0 | |
| CIUDAD PEMEX | airport | Mexico | 17.88 | -92.48 | 20 | 0 | |
| CIUDAD PIAR | airport | Venezuela | 7.49 | -63.27 | 879 | 0 | |
| CIVIC CENTER | airport | United States | 33.68 | -118.00 | 157 | 0 | |
| CIVISTA MEDICAL CENTER | airport | United States | 38.53 | -76.97 | 168 | 0 | |
| CIW (CANOUAN) | airport | St. Vincent & Grenadines | 12.70 | -61.34 | 11 | 0 | |
| CIX (CAPT JOSE A QUINONES GONZALES INTL) | airport | Peru | -6.79 | -79.83 | 97 | 0 | |
| CIY (Comiso Airport) | airport | 36.99 | 14.61 | 623 | 0 | ||
| CIZ (Coari Airport) | airport | -4.13 | -63.13 | 131 | 0 | ||
| CIZEK NORTH | airport | United States | 61.63 | -149.68 | 300 | 0 |