| McElroy, William P. | | | NYANZA | First Mate |
| McElroy, William P.; 1907 Red Book; 1907 | 1907 Red Book | 1907-00-00 | CAMBRIA | Captain |
| McElroy, William P.; 1908 Lynn's; 1908 | 1908 Lynn's | 1908-00-00 | MARITANA | Captain |
| McElroy, William P.; 1909 Red Book; 1909 | 1909 Red Book | 1909-00-00 | SIR WILLIAM SIEMENS | Captain |
| McElroy, William P.; 1910 Red Book; 1910 | 1910 Red Book | 1910-00-00 | SIR WILLIAM SIEMENS | Captain |
| McElroy, William P.; 1911 Red Book; 1911 | 1911 Red Book | 1911-00-00 | SIR WILLIAM SIEMENS | Captain |
| McElroy, William P.; 1912 Red Book; 1912 | 1912 Red Book | 1912-00-00 | SAMUEL F. B. MORSE | Captain |
| McElroy, William P.; 1913 Red Book; 1913 | 1913 Red Book | 1913-00-00 | SAMUEL F. B. MORSE | Captain |
| McElroy, William P.; 1914 Red Book; 1914 | 1914 Red Book | 1914-00-00 | SAMUEL F. B. MORSE | Captain |
| McElroy, William P.; 1915 Red Book; 1915 | 1915 Red Book | 1915-00-00 | SAMUEL F. B. MORSE | Captain |
| McElroy, William P.; 1916 Green's | 1916 Green's | | WILLIAM E. COREY | Captain |
| McElroy, William P.; 1920 Red Book; 1920 | 1920 Red Book | 1920-00-00 | WILLIAM J. OLCOTT | Captain |
| McElroy, William P.; 1922 Red Book; 1922 | 1922 Red Book | 1922-00-00 | D. G. KERR | Captain |
| McElroy, William P.; 1923 Red Book; 1923 | 1923 Red Book | 1923-00-00 | D. G. KERR | Captain |
| McElroy, William P.; 1925 Red Book; 1925 | 1925 Red Book | 1925-00-00 | | Fleet Captain |
| McElroy, William P.; 1926 Red Book | 1926 Red Book | | | Fleet Captain |
| McElroy, William P.; 1927 Red Book; 1927 | 1927 Red Book | 1927-00-00 | | Fleet Captain |
| McElroy, William P.; 1928 Red Book; 1928 | 1928 Red Book | 1928-00-00 | | Fleet Captain |
| McElroy, William P.; 1929 Red Book; 1929 | 1929 Red Book | 1929-00-00 | | Fleet Captain |
| McElroy, William P.; 1930 Red Book; 1930 | 1930 Red Book | 1930-00-00 | | Fleet Captain |
| McElroy, William P.; 1931 Red Book; 1931 | 1931 Red Book | 1931-00-00 | | Fleet Captain |
| McElroy, William P.; 1932 Red Book; 1932 | 1932 Red Book | 1932-00-00 | | Fleet Captain |
| McElroy, William P.; 1933 Red Book; 1933 | 1933 Red Book | 1933-00-00 | | Fleet Captain |
| McElroy, William P.; 1934 Red Book; 1934 | 1934 Red Book | 1934-00-00 | | Fleet Captain |
| McElroy, William P.; 1935 Red Book; 1935 | 1935 Red Book | 1935-00-00 | | Fleet Captain |
| McElroy, William P.; 1937 Blue Book; 1937 | 1937 Blue Book | 1937-00-00 | | Fleet Captain |
| McElroy, William P.; 1938 Red Book; 1938 | 1938 Red Book | 1938-00-00 | | Fleet Captain |
| McElroy, William P.; 1939 Red Book; 1939 | 1939 Red Book | 1939-00-00 | | Fleet Captain |
| McElroy, William P.; 1941 Red Book; 1941 | 1941 Red Book | 1941-00-00 | | Fleet Captain |
| McElroy, William P.; Great Lakes News 4/44; 1944 | Great Lakes News 4/44 | 1944-00-00 | LAFAYETTE | First Mate |
| McElroy, William P.; Great Lakes News 4/44; 1944 | Great Lakes News 4/44 | 1944-00-00 | MARITANA | Captain |
| McElroy, William P.; Great Lakes News 4/44; 1944 | Great Lakes News 4/44 | 1944-00-00 | | Fleet Captain |
| McElroy, William P.; LCA Bulletin 10/42; 1942 | LCA Bulletin 10/42 | 1942-00-00 | D. G. KERR | Captain |
| McElroy, William P.; LCA Bulletin, July, 1940 | LCA Bulletin, July, 1940 | 1940-00-00 | | Fleet Captain |