In 74 stories, Nero Wolfe leaves the brownstone 35 times and does NOT leave the Brownstone 39 times.
Thus, despite numerous statements by Wolfe and Archie regarding his abhorrence of leaving the brownstone, he does in fact do so. In addition to the occurrences noted below, by inference and statements in the books he leaves for personal errands such as his tailor, doctor, dentist, haircuts, meals at Rusterman's, visits to Hewitt's Long Island estate, etc.
Stories where Nero Wolfe leaves the brownstone
#2 – League of Frightened Men:
Kidnapped, sort of, by a certain taxi driver; Wolfe is attempting to find Archie
#4 – The Red Box:
The client manages to maneuver Wolfe out of the house on business, to investigate murder at Boyden McNair,
#5 – Too Many Cooks:
To address the attendees at a meeting of the 15 masters at a resort in West Virginia on American Cuisine
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6 – Some Buried Caesar: To attend show upstate to display orchids
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8 – Where There's a Will: To the Hawthorne residence on 67th St in a taxi
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10 – Black Orchids: To view the much coveted black orchids
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12 – Not Quite Dead Enough: To exercise with Fritz- and- 10th precinct to get AG
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13 – Booby Trap: To meet with Col Ryder of Military Intelligence
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16 – The Silent Speaker: To Centre Street police headquarters to report to Ash
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23 – Door to Death: To hire Andy Krasicki to replace Theodore temporarily
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24 – The Second Confession: To the Sperling household upstate
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25 – Cop Killer: To his barber shop, get a haircut, close the case
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28 – In the Best Families:
To GET Zeck
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29 – Squirt & The Monkey
Well, technically, down the stoop to talk to Cramer
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30 – Murder by The Book" To have dinner with Marko at Rusterman's
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32 – This Won't Kill You: To a baseball game with Pierre Mondor & Archie
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33 – Prisoner's Base: Once again to the 10th precinct to get Archie
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34 – Invitation to Murder: To the Lewent house 2 miles from the Brownstone
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39 – The Black Mountain
To hunt down Marko's murderer in Montenegro
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40 – The Next Witness: To testify in court (he didn't), Wolfe leaves court (to avoid a smelly woman) and investigates with Archie at a midtown office and an upstate country home.
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41 – Immune to Murder: To prepare & serve his famous brook trout dish
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42 – Before Midnight: To LBA to search for cyanide with the 'teers
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44 – Too Many Detectives: To testify in Albany re wire-tapping
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46 – The Christmas Party: To play Santa and spy on Archie
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49 – Fourth of July Picnic: To make a speech at picnic for URWA for Felix
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53 – Poison a la Carte: Attended the "10 for Aristology" doomed dinner
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54 – Method Three for Murder: Tough one: Technically, yes, to the threshold/stoop
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58 – Plot It Yourself: To meet with the NAAD committee et al
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59 – The Rodeo Murder: To dine on blue grouse at Lily's apartment
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63 – The Final Deduction: With AG to Doc Vollmer's to stall being questioned
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66 – The Mother Hunt:
To escape Cramer before he is ready to name the killer
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69 – The Doorbell Rang: To Hewitt on LI to 'cook' up a scheme
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71 – The Father Hunt: Not business: to view & 'talk' orchids with Hewitt
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72 – Death of a Dude:
To Montana to help Archie solve a murder so Archie will come back to Manhattan expeditiously
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74 – A Family Affair: To Rusterman's to see Pierre Duco's father
Stories where Nero Wolfe does NOT leave the brownstone
# 1 – Fer-de-Lance
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3 – The Rubber Band
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7 – Over My Dead Body
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9 – Bitter End
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11 – Cordially Invited to Meet Death
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14 – Help Wanted, Male
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15 – Instead of Evidence
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17 – Before I Die
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18 – Too Many Women
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19 – Man Alive
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20 – Bullet for One
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21 – And Be a Villain
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22 – Omit Flowers
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26 – The Gun with Wings
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27 – Disguise for Murder
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31 – Home to Roost
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35 – The Zero Clue
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36 – The Golden Spiders
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37 – When a Man Murders
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38 – Die like a Dog
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43 – A Window for Death
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45 – Might As Well Be Dead
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47 – Easter Parade
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48 – If Death Ever Slept
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50 – Frame-up for Murder
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51 – Murder is No Joke
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52 – Champagne for One
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55 – Eeny Meeny Murder Mo
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56 – Assault on a Brownstone
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57 – Counterfeit for Murder
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60 – Death of a Demon
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61 – Too Many Clients
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62 – Kill Now — Pay Later
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64 – Murder is Corny
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65 – Gambit
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67 – Blood Will Tell
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68 – A Right to Die
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70 – Death of a Doxy
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73 – Please Pass the Guilt
