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| Russ Boarding House | 1897 | 200 First Street | Gable-end vernacular |
| Scandia Hotel | 1883 | 225 First Street | Greek Revival |
| L'Tosca Hotel | 1869 | 233 First Street | Greek Revival |
| Our Corner Saloon | 1880 | 301 First Street | |
| White Laundry | 1880 | 307 First Street | |
| E. E. Janssen Building | 1878 | 422 First Street | Italianate Victorian |
| H. H. Buhne Store | 1869 | 423 First Street | Classically detailed façade. |
| Buhne Boarding House and Hardware Store | 1888 | 424-432 First Street | Italianate Victorian |
| Fior D'Italia Hotel | 1911 | 110 Second Street | Originally a four-story Renaissance Revival building, but the third and fourth stories were removed. |
| Ferrari Building | 1910 | 123-125 Second Street | Much remodeled Italianate Victorian |
| Eagle House | 1886 | 139 Second Street | Stick Victorian |
| McGaraghan Commercial Building | 1891 | 201-209 Second Street | Italianate Victorian |
| Original Name Unknown | 1930 | 219-221 Second Street | Art Deco |
| Saloon | 1890 | 223 Second Street | Predates 1890 |
| Sawtelle Building | 1885 | 301 Second Street | The original cast-iron front was removed or covered over. Little remains of the original style. |
| Electric Motors (Bicycle Shop)/California Fruit Market | 1894 | 324-328 Second Street | Eastlake style commercial building |
| Healy Brothers' Building | 1908 | 327 Second Street | Modified Classical Revival |
| Alonzo Monroe Building | 1876 | 402-410 Second Street | Built as a series of five one-story brick buildings with twelve-inch thick walls for fire protection. |
| Long Building | 1877 | 403-411 Second Street | Cast iron storefronts. Build was restored in 1976. |
| Harvey & McLaren Saloon | 1892 | 412 Second Street | Classical Revival |
| Cousins Building | 1874 | 414-418 Second Street | Mission Revival |
| Long Building | 1892 | 417 Second Street | Classical elements and Eastlake detailing |
| No Historical Name | 1880 | 420-422 Second Street | Classical Revival. "Handsome example of a typical American building which combines ground-floor commercial space with offices or living quarters above." |
| Loewenthal Building-The Louvre | 1879 | 426 Second Street | Eclectic |
| Crystal Palace Saloon | 1872 | 509 Second Street | Much altered Neo-Baroque design |
| Vance Garage | 1930 | 511 Second Street | Mission Revival |
| No Historical Name | 1886 | 516 Second Street | |
| Vance Building | 1869 | 521 Second Street | Flat-front Italianate |
| Vance Hotel | 1872 | 525 Second Street | Italianate |
| Masonic Hall | 1893 | 528 Second Street | |
| Buhne Hall | 1870 | 620 Second Street | Italianate |
| Axe Building/GAR Hall | 1881 | 622 Second Street | False-front vernacular |
| Victorian Commercial Building | 1886 | 626 Second Street | Italianate |
| Kimball Building | 1878 | 630-638 Second Street | Vernacular interpretation of Greek Revival |
| No Historical Name | 1895 | 715 Second Street | Gable-end vernacular |
| No Historical Name | 1895 | 717 Second Street | Gable-end vernacular |
| No Historical Name | 1909 | 723-725 Second Street | Colonial Revival flats |
| No Historical Name | 1920 | 728 Second Street | Craftsman cottage |
| No Historical Name | 1920 | 731 Second Street | Craftsman cottage |
| No Historical Name | 1889 | 732 Second Street | Wood-Frame, gable-end house remodeled in the Craftsman style |
| No Historical Name | 1870 | 737 Second Street | Vernacular residential complex with a main dwelling from the 1870's and additions from various periods |
| No Historical Name | 1944 | 738 Second Street | Victorian building, original date unknown, which was remodeled in 1944. |
| Connick House | 1871 | 803 Second Street | Italianate dwelling |
| No Historical Name | 1870 | 811 Second Street | Wood-Frame, gable-end house |
| Johnson House | 1906 | 812 Second Street | Classical Revival house |
| Johnson House | 1901 | 816 Second Street | Classical Revival house |
| Vernacular Greek Revival House | 1860 | 816 Second Street (Rear) | Greek Revival |
| No Historical Name | 1865 | 817 Second Street | Vernacular simplification of Greek Revival style |
| Graham Doublehouse | 1873 | 822-826 Second Street | Italianate duplex |
| No Historical Name | 1921 | 825 Second Street | Craftsman bungalow |
| No Historical Name | 1921 | 829 Second Street | Bungalow |
| Graham House | 1870 | 837 Second Street | Wood-frame, vernacular duplex |
| No Historical Name | 1920 | 837 Second Street (Rear) | |
| No Historical Name | 1880 | 901 Second Street | Remodeled in the 1920's |
| Young House | 1888 | 1006 Second Street | Queen Anne/Eastlake Victorian moved to this site in 1978 |
| Murphy House | 1867 | 1020 Second Street | Simplified Greek Revival |
| Carson House | 1903 | 1034 Second Street | Moved to this site around 1985 |
| Carson Carriage House and Servants' Quarters | 1889 | 1116 Second Street | Wood-Frame, vernacular gable-end |
| Maffia and Brambini Building | 1917 | 107 Third Street | |
| Female Boarding House | 1898 | 123 Third Street | Eastlake Victorian |
| No Historical Name | 1887 | 125-129 Third Street | Vernacular, end gable Greek Revival |
| Williams Building | 1904 | 403 Third Street | Neoclassical commercial |
| Russ Building | 1883 | 527 Third Street | Victorian commercial |
| No Historical Name | 1890 | Third and G Streets | Remodeled during the 1930's or 1940's |
| Pioneer Hall | 1890 | 621-623 Third Street | Victorian with recent remodeling |
| Graham House | 1891 | 711 Third Street | Italianate with Eastlake elements |
| Graham House | 1895 | 717-719 Third Street | Queen Anne with Eastlake elements |
| Chamberlain Duplex | 1907 | 804-806 Third Street | Neoclassical residence |
| Sinclair House | 1903 | 805 Third Street | Neoclassical residence |
| Murray House | 1870 | 813 Third Street | Vernacular house |
| Hart House | 1885 | 816 Third Street | Vernacular house |
| Seward Apartment Building | 1907 | 832-838 Third Street | Colonial Revival |
| No Historical Name | 1889 | 833 Third Street | |
| Graham House | 1892 | 837 Third Street | Queen Anne/Eastlake duplex |
| McFarland House | 1887 | 905 Third Street | Victorian with probable modernizations |
| McFarland House | 1895 | 911 Third Street | Queen Anne . One of six houses built by S. W. McFarland between 1894 and 1904. |
| McFarland House | 1895 | 917 Third Street | Queen Anne |
| McFarland House | 1904 | 923 Third Street | Neoclassical |
| McFarland House | 1895 | 931 Third Street | Duplicate of 911 Third Street |
| McFarland House | 1901 | 935 Third Street | Queen Anne rowhouse |
| Bell House | 1889 | 1023 Third Street | Victorian cottage |
| Broderick House | 1880 | 1026 Third Street | Vernacular Italianate |
| No Historical Name | | 1027 Third Street | |
| Ellesmore House | 1870 | 1125 Third Street | Vernacular gable-end house |
| No Historical Name | 1858 | 1125 Third Street | Vernacular gable-end house |
| No Historical Name | 1858 | 1134 Third Street | Vernacular gable-end house |
| Smith House | 1870 | 1228 Third Street | Vernacular gable-end house |
| 1876 Philip Needs Building | 1876 | 100 C Street | Greek Revival |
| Western States Gas & Electric Company Warehouse | 1890 | 100 C Street | |
| Eagle House | 1880 | C Street and Snug Alley | Italianate |
| Humboldt Engineering and Supply Company Building | 1908 | 202-210 C Street and 118-138 Second Street | Wooden commercial building |
| No Historical Name | | Foot of D Street | Warehouse for goods shipped by train and boat |
| Hotel Metropolis | | 217 D and 300-308 Second Street | 20th Century Classical Revival |
| No Historical Name | | E Street at Waterfront (West Side) | Warehouse |
| No Historical Name | | E Street at Waterfront (East Side) | Warehouse |
| Feed and Seed Warehouse | 1940 | 65 E Street | False front warehouse with stepped parapet |
| Feuerwerker's | 1919 | 86 E Street | Built in 1919 and significantly modified in 1926 |
| Bell Building | 1892 | 210-216 E Street and 320-334 Second Street | |
| Monroe Building | 1876 | 213 E Street | Brick building with flat roof and false front. Identical to 217 E Street |
| Monroe Building | 1876 | 217 E Street | Identical to 213 E Street |
| Bank of Eureka | 1911 | 240 E Street | Classical Revival designed by Albert Pissis who graduated from the Ecole des Beaux Arts in Paris |
| Carr Building | 1871 | 312 E Street | Italianate false-front commercial building |
| Hensel's Eureka Bakery & Confectionary | 1879 | 314 E Street | Italianate false-front commercial building |
| Georgeson Building/Central Hotel | 1903 | 333-339 E Street | Renaissance Revival |
| No Historical Name | 1917 | 350 E Street | Reinforced concrete Classical Revival |
| Coggeshell Launch | 1900 | 69 F Street | Bay warehouse converted into a railway depot in 1916 |
| Weaver Building (National Register Listing #74000511) | 1892 | 102 F Street | Eastlake Victorian |
| McDonald Building (National Register Listing #82000966) | 1904 | 108 F Street | Classical Revival |
| Antonsen/Snug Building | 1890 | 109-117 F Street | Italianate |
| Odd Fellows Hall | 1882 | 123-131 F Street | Second Empire |
| Rick's Building | 1878 | 203-215 F Street and 525 Second Street | Originally constructed of brick with cast -iron storefronts. Embodies the change from wooden commercial buildings to brick commercial buildings |
| Palmtag Building | 1893 | 208-210 F Street and 432-434 Second Street | Queen Anne commercial building |
| No Historical Name | | 212 F Street | |
| Carson Block Building | 1891 | 227-239 F Street | Brick and terra cotta building designed by Samuel Newsom in the Sullivanesque style |
| Jones Building | 1876 | 234 F Street | |
| Buhne Building | 1884 | 211 G Street | Renaissance Revival designed by Kennitzer and Raun |
| McGrath Boarding House | 1865 | 112 I Street | |
| No Historical Name | 1870 | 122 I Street | Vernacular gable-end house and 1922 garage addition |
| No Historical Name | 1910 | 206 I Street | Craftsman bungalow |
| No Historical Name | 1939 | 215 I Street | |
| No Historical Name | 1889 | 233 I Street | Vernacular house |
| Bullock House | 1880 | 317 I Street | Vernacular Italianate |
| Northwest Pacific Railroad Tracks and Sign | 1916 | Foot of J Street | |
| No Historical Name | 1920 | 219 J Street | Originally built as a garage behind the house at 905 Third Street |
| No Historical Name | 1870 | 304 L Street | Vernacular house |
| No Historical Name | 1880 | 314 L Street | Hipped-roof cottage |
| Dolbeer Carson Lumber Company | 1916 | 100 M Street | Renaissance Revival |
| Carson Mansion and Carriage House | 1884 | 143 M Street | "Encyclopedic array of Eastlake and Queen Anne forms and details" |
| Carson (J. Milton) House | 1889 | 202 M Street | Queen Anne with Eastlake detailing designed by Newsom brothers of San Francisco |
| Brant House | 1905 | 305 M Street | Craftsman bungalow |
| No Historical Name | 1930 | 320 M Street | |
| No Historical Name | 1915 | 304 N Street | Craftsman house and 1920['s garage |
| No Historical Name | 1920 | Opera Alley Between B and C Streets | One-car garage c.1920 |
| No Historical Name | 1920 | Opera Alley Between B and C Streets | Two-car garage probably built between 1940 and 1940 |
| No Historical Name | 1880 | 409 Opera Alley | Two-story, false front building. |
| No Historical Name | 1900 | 411-413 Opera Alley | Two-story, false front building. |
| No Historical Name | 1900 | 415 Opera Alley | |
| No Historical Name | 1890 | 421 Opera Alley | |
| No Historical Name | 1889 | Opera Alley Between E and F Streets | |
| No Historical Name | 1890 | Opera Alley Behind 426 Second Street | |
| No Historical Name | 1900 | 519 Opera Alley | Vernacular, two-story, end gable building. |
| No Historical Name | 1880 | 626 Opera Alley | Two-story, false front building. |
| Sinclair Barn | 1900 | Opera Alley Behind 805 Third Street | Vernacular outbuilding |
| Sinclair Garage | 1920 | Opera Alley Behind 805 Third Street | |
| Vernacular Dwelling | 1910 | Opera Alley Behind 817 Third Street | |
| No Historical Name | 1880 | Opera Alley Behind 911 Third Street | One-room, rectangular outbuilding |
| No Historical Name | 1910 | Opera Alley Behind 931 Third Street | Single-car garage probably built sometime between 1910 and 1930. |
| F. Bell Outbuilding | 1889 | Opera Alley Behind 1023 Third Street | One-story, Victorian outbuilding |
| Blacksmith and Wagon Works | 1889 | 217 Snug Alley | Predates 1889 |
| Apartment and Garage | 1930 | Snug Alley Behind 223 Second Street | |
| No Historical Name | 1880 | Snug Alley Between F and G Streets | Three intact outbuildings built as livery stables and garages between 1880 and 1930 |
| No Historical Name | 1920 | Snug Alley Behind 732 Second Street | Two-car garage probably built between 1940 and 1940 |