Which areas of Ely were worst hit?

It is immediately clear from the map that the greatest number of casualties lived in the poorer areas of the city around Broad Street and the river, or on the edge of the city where the farmworkers congregated.  A further forty farmworkers who appear on the main Ely memorial lived outside of the city boundaries, chiefly in Prickwillow, but also in Stuntney, (Queen) Adelaide, Shippea Hill and Chettisham.

Below the men are grouped by street - in most cases this information comes from the 1911 census.  This allows us to guess at possible friendship groups, although obviously other friendships would have been created at school, in work, and, for many, through organisations such as the Territorial Army.
Annesdale: Herbert Adcock, Arthur Canham, George Canham, George Cross, Maurice Plumb
Babylon: Percy Richards
Back Hill: George Bowles, William Clarke, John Cook, Leslie Covill, Harry Knowles, Arthur Page, Edgar Pamment, Victor Pamment
Barton Road: John Atkin, Walter Black, James Elsden, Edward Everett, Herbert Everson, William Lavender, James Simpkins, Edward Sykes
Barton Square: Herbert Vail
Bohemond Street: John P. Sadler
Broad Street: Ted Cox, Percy Fox, Alfred Layton, Reginald Toombs, Percy Woods
Bull Lane (Lisle Lane): Matthew Brinkley, James Dalton, George Howlett, Albert Illett, Albert Prior
Cambridge Road; Rowland Clarke, Albert Covill, Thomas Dann, Jim Gent, Alfred Giddens, Henry Hudson, Reuben Lemmon, Edward Martin, James Pate, Edward Stockdale, Frank Strapps,
Chapel Street: George Nicholas, Albert Taylor
Chiefs Lane: Charles Shelton, Fred Shelton, Thomas Shelton, Emery Topping
Downham Road: Arthur Drake, John Granfield
Fieldside: Maurice Brown, Thomas Layton, Ernest Reed, Sidney Strawson, Alfred Woodbine,
Fore Hill: Albert Cowley, James Everitt, Thomas Woodroffe
Harlock Lane: Charles Haylock, Herbert Page
High Street: Victor Beckett, Percy Pledger
Hills Lane: Herbert Beamiss, Charles Hills, Herbert Pope,
Isle of Ely Police Accommodation: William Cheney, Arthur Cornwell, Sydney Lown
Ingrams Road: John Sindle
Lynfield Terrace: Bertie Gentry, Billy Smith
Lynn Road: Frank Baker, Bert Dorling, Cecil Keenlyside
Market Street: David Lowe
New Barns Road: George Benton, David Bird, Arthur Cross, George Cross, Mark Hammond, George Jugg, Frederick  Rumbelow
Newnham Street: Bert Armsby, Sidney Benton, John Chapman, St Arnand Creak, Harry Lawrence, Arnold Lemmon, (Oliver Scott)
Newnham Terrace: Charles Cottam
Nutholt Lane: William Claydon
Parade Lane: Fred Sykes
Prickwillow Road/Lindum Common Road: Walter Butcher, Frederick Clarke, James Hamey, Arnold Peacock
Potters Lane: Thomas Barnard-Moden, James Clarke, Herbert Cross, Alfred Wayman, George Wayman
Quayside: Robert Cox
Railway Terrace (Castlehythe): Rex Barwick, Charles Chard
Ship Lane: Albert Hitch
Silver Street: Norman Barnett, George Dexter, Thomas Lee, William Lee, Charles Lucas, Harold Royston, John Saberton, Fredrick Wayman, Fisher Webster, Thomas Yarrow
Springhead Lane: Francis Gathercole
St John’s Place: John Moden
St John’s Road: Arthur Newell, James Thompson, James Wayman
St Mary’s Street: Stanley Beer, William Beer, Herbert Harris, Sydney Harris, Alfred Punchard, Edmund Punchard, Arthur Tyndale
Station Road: Leonard Benton, William Benton, John Lupson, Walter Norman
The College: John Crosby, John Fruin
The Range: George Sutton
Three Blackbirds Yard (off Broad Street): Sydney Peachey, Abraham Smith
Victoria Street: Percy Bidwell, Harold Moden, Eric Woodrow
Waterside: Jack Bidwell, Sydney Butcher, Bill Fendick, Reginald Hall, Frank Lambert, John Negus, Charles Newman, Ernest Royal, George Royal,  James Smith
West End; Roland Morriss, Thomas Morris,
West Fen Road: Stanley Aspland, Dick Clark, Ernest Lee, Henry Mortiss, John Osborne, Leslie Pate, Albert Price, William Ray, Ralph Watson
Willow Walk: Billy Cole
 
And outside the main city;
(Queen) Adelaide: James Fitch, George Gathercole, Zachariah Harrison, Geoffrey Lawrence, Walter Lawrence, Benjamin Lee, Reginald Seekings, William Wright
Chettisham: James Elsegood
Kenny Hill: Robert Mann
Prickwillow and surrounding Fen: Bertie Bonnett, Francis Cross, Arthur Crunkhorn, John Day, William Fletcher, James Fuller, Albert Gage, Sydney Gage, Stanley Lambert, George Lee, Sydney Lee, George Neal, Lancelot Palmer, Arthur Pask, Russell Peachey, Samuel Powell, John Rice, George Rolfe, John T. Sadler, Ernest Thomas, Sydney Watts, Herbert White
Redmere: Samuel Wilding
Stuntney: Herbert Holliday, Thomas Lemmon, Willie Mayle, Bert Parker McGee, Edward Parker McGee, James Parker McGee, Thomas Parker McGee, Harry Norden
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No close relatives left in the area: Herbert Grey, William Grey, Joseph Kirby, Charles Manning,  Joseph Webb