HMV - CA 10 series - Canadian 10" 78s
HMV - CA 11 series - Canadian 12" 78s
RCA - US 11 series - 12" 78s
HMV - US 12 series - 12" 78s Red Seal Classical
RCA - US 15 series - 12" 78s Heritage Series
RCA - US 17 series - Immortal Classical Performances - WCT
RCA - US 18 series - 12" 78s Red Seal Deluxe
RCA - US 19 series - Broadway Shows - WOC (original cast)
RCA - US 20 series - 78s - Popular
RCA - US 21 series - 78s - Bluebird - Country counterpart to the 48 series Country 45s
RCA - US 22 series - 78s - Rhythm and Blues counterpart to the 50 series Rhythm and Blues 45s
RCA - US 23 series - 78s - International series
HMV - US 25 series - 78s - International
HMV - US 26 series - 78s - International
RCA - US 27 series - Immortal Popular Performances - WPT
RCA - US & CA 30 series - 78s - Bluebird Popular 30-0801 (November 1942) - 30-0834 (March 1945).
RCA - US 31 series - 78s - Bluebird - Popular - only a handful ever used beginning at 31-0001 (July 1949)
RCA - US & CA 33 series - 78s - Bluebird - Country - 33-0500 (November 1942) - 33-0539 (December 1945)
RCA - US 34 series - 78s - Bluebird - Race 34-0700 (October 1942) - 34-0748 (May 1946).
RCA - US 35 series - 78s - Bluebird - Race 35-0001 (July 1949)
RCA - US 37 series - "Compact Single 33" small hole, plays at 33 1/3 RPM
RCA - US 40 series - 78s - 100 Educational records then the Hot Jazz series
RCA - US 41 series - Educational
RCA - US 42 series - 78s - Immortal Performances (78 counterpart to the 27 series)
RCA - US 43 series - 78s - International
RCA - US 45 series - 78s - Popular Classics, Children's and Educational
RCA - US 46 series - 78s - EPs - 2 Al Goodman's so far
RCA - US 47 series - Popular Mono -ends in the early 70's overlaps the 74 series, Dolly Parton was 9999
RCA - US 48 series - Country (first issues on green vinyl), stopped at 501,
RCA - US 48 series - Popular Mono continued - 48-1000 follows 47-9999
RCA - US 49 series - Classical (Red Seal Records on red vinyl)
RCA - US 50 series - Rhythm and Blues (first issues on cerise vinyl)
RCA - US 51 series - 5000s = Latin America series
RCA - US 52 series - Popular Classics - mostly Al Goodman and his Orchestra (on blue vinyl)
RCA - US 53 series - International
RCA - US 54 series - 45s - Bluebird Popular - counterpart 30 series for 78s
RCA - CA 55 series - 78s - Bluebird - Country 55-3201 (January 1943) to at least 55-3244 (May 1949)
RCA - CA 55 series - 78s - Bluebird - French Canadian, 55-5201 (January 1943) to at least 55-5409 (May 1951)
RCA - CA 56 series - 78s
RCA - CA 57 series - Canada International
RCA - US 58 series - Groove (?)
RCA - CA 58 series - 78s - Bluebird - Country 58-0001 (March 1946) to at least 58-0215 (circa October 1951).
(This is a reissue of the 21- prefixed series)
RCA - US 59 series - Chart Records
RCA - US 61 series - "Living Stereo"
RCA - US 63 series - Calendar and Kirshner
RCA - US 65 series - Grunt
RCA - US 66 series - Colgems
RCA - US 68 series - "Living Stereo" Compact 33 1/3s
RCA - US 71 series - Gregar
RCA - US 73 series - Wooden Nickel
RCA - US 74 series - Popular Stereo
RCA - CA 74 series - includes Nimbus Records
RCA - US 75 series - Mexico?
RCA - US 78 series - Chelsea Records
RCA - US 95 series - Greece (?)
RCA - US 249 series - Bluebird Classics
RCA - US 420 series - 78s - Gold Standard (reissues)
RCA - US 447 series - Gold Standard (reissues)
RCA - US 449 series - mostly EPs, a few 45s - Immortal Classical EPs
RCA - US 547 series - popular EPs
RCA - US 549 series - classical EPs
RCA - US 599 series - "special issue" EPs
RCA - US D series - Daybreak Records
RCA - OZ D series - Australia - Dunhill recordings
RCA - US Box Sets
Groove - US - RCA subsidiary
X - US - RCA subsidiary
Actually, the US 74- series was all-stereo, while 47- (the 45 RPM equivalent of the 78 RPM 20- series) was mostly mono (only two 45's in that series that I know of had one stereo side, in each case the B-side: "Memories" by Elvis Presley (stereo B-side "Charro," 47-9731) and the 1969 reissue of "Get Together" by The Youngbloods (stereo B-side "Beautiful," 47-9752). And the 78 RPM equivalent of the 45 RPM 447- reissue series was 420-. And 48-1000 was what followed 47-9999.
RCA Records - 40 prefix series - 78s - includes Hot Jazz
RCA Records - 47 prefix series - Popular mono
RCA Records - 48 prefix series - Country
RCA Records - 50 prefix series - R&B
Groove Records - 4G & 58 prefix series
Grunt Records - 65 prefix series
Wooden Nickel - 73 prefix series
"X"/Vik Records - subsidiary of RCA Records